diff --git a/cocoa/base/AppDelegateBase.m b/cocoa/base/AppDelegateBase.m
index 9fcac96a..6322ad61 100644
--- a/cocoa/base/AppDelegateBase.m
+++ b/cocoa/base/AppDelegateBase.m
@@ -170,7 +170,7 @@ http://www.hardcoded.net/licenses/bsd_license
 
 - (void)startScanning
 {
-    [[self resultWindow] startDuplicateScan:nil];
+    [[self resultWindow] startDuplicateScan];
 }
 
 
diff --git a/cocoa/base/ResultWindow.h b/cocoa/base/ResultWindow.h
index 3d62d260..912ab6d9 100644
--- a/cocoa/base/ResultWindow.h
+++ b/cocoa/base/ResultWindow.h
@@ -54,33 +54,33 @@ http://www.hardcoded.net/licenses/bsd_license
 - (void)adjustUIToLocalization;
 
 /* Actions */
-- (IBAction)changeOptions:(id)sender;
-- (IBAction)copyMarked:(id)sender;
-- (IBAction)trashMarked:(id)sender;
-- (IBAction)exportToXHTML:(id)sender;
-- (IBAction)filter:(id)sender;
-- (IBAction)focusOnFilterField:(id)sender;
-- (IBAction)ignoreSelected:(id)sender;
-- (IBAction)invokeCustomCommand:(id)sender;
-- (IBAction)markAll:(id)sender;
-- (IBAction)markInvert:(id)sender;
-- (IBAction)markNone:(id)sender;
-- (IBAction)markSelected:(id)sender;
-- (IBAction)moveMarked:(id)sender;
-- (IBAction)openClicked:(id)sender;
-- (IBAction)openSelected:(id)sender;
-- (IBAction)removeMarked:(id)sender;
-- (IBAction)removeSelected:(id)sender;
-- (IBAction)renameSelected:(id)sender;
-- (IBAction)reprioritizeResults:(id)sender;
-- (IBAction)resetColumnsToDefault:(id)sender;
-- (IBAction)revealSelected:(id)sender;
-- (IBAction)saveResults:(id)sender;
-- (IBAction)startDuplicateScan:(id)sender;
-- (IBAction)switchSelected:(id)sender;
-- (IBAction)toggleColumn:(id)sender;
-- (IBAction)toggleDelta:(id)sender;
-- (IBAction)toggleDetailsPanel:(id)sender;
-- (IBAction)togglePowerMarker:(id)sender;
-- (IBAction)toggleQuicklookPanel:(id)sender;
+- (void)changeOptions;
+- (void)copyMarked;
+- (void)trashMarked;
+- (void)exportToXHTML;
+- (void)filter;
+- (void)focusOnFilterField;
+- (void)ignoreSelected;
+- (void)invokeCustomCommand;
+- (void)markAll;
+- (void)markInvert;
+- (void)markNone;
+- (void)markSelected;
+- (void)moveMarked;
+- (void)openClicked;
+- (void)openSelected;
+- (void)removeMarked;
+- (void)removeSelected;
+- (void)renameSelected;
+- (void)reprioritizeResults;
+- (void)resetColumnsToDefault;
+- (void)revealSelected;
+- (void)saveResults;
+- (void)startDuplicateScan;
+- (void)switchSelected;
+- (void)toggleColumn:(id)sender;
+- (void)toggleDelta;
+- (void)toggleDetailsPanel;
+- (void)togglePowerMarker;
+- (void)toggleQuicklookPanel;
 @end
diff --git a/cocoa/base/ResultWindow.m b/cocoa/base/ResultWindow.m
index 5e0d3ea0..de342c93 100644
--- a/cocoa/base/ResultWindow.m
+++ b/cocoa/base/ResultWindow.m
@@ -39,7 +39,7 @@ http://www.hardcoded.net/licenses/bsd_license
     [self initResultColumns];
     [self fillColumnsMenu];
     [matches setTarget:self];
-    [matches setDoubleAction:@selector(openClicked:)];
+    [matches setDoubleAction:@selector(openClicked)];
     [self adjustUIToLocalization];
     
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(jobStarted:) name:JobStarted object:nil];
@@ -79,7 +79,7 @@ http://www.hardcoded.net/licenses/bsd_license
     }
     [[app columnsMenu] addItem:[NSMenuItem separatorItem]];
     NSMenuItem *mi = [[app columnsMenu] addItemWithTitle:TR(@"Reset to Default")
-        action:@selector(resetColumnsToDefault:) keyEquivalent:@""];
+        action:@selector(resetColumnsToDefault) keyEquivalent:@""];
     [mi setTarget:self];
 }
 
@@ -120,21 +120,21 @@ http://www.hardcoded.net/licenses/bsd_license
 }
 
 /* Actions */
-- (IBAction)changeOptions:(id)sender
+- (void)changeOptions
 {
     NSInteger seg = [optionsSwitch selectedSegment];
     if (seg == 0) {
-        [self toggleDetailsPanel:sender];
+        [self toggleDetailsPanel];
     }
     else if (seg == 1) {
-        [self togglePowerMarker:sender];
+        [self togglePowerMarker];
     }
     else if (seg == 2) {
-        [self toggleDelta:sender];
+        [self toggleDelta];
     }
 }
 
-- (IBAction)copyMarked:(id)sender
+- (void)copyMarked
 {
     NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
     [model setRemoveEmptyFolders:n2b([ud objectForKey:@"removeEmptyFolders"])];
@@ -142,62 +142,62 @@ http://www.hardcoded.net/licenses/bsd_license
     [model copyMarked];
 }
 
-- (IBAction)trashMarked:(id)sender
+- (void)trashMarked
 {
     NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
     [model setRemoveEmptyFolders:n2b([ud objectForKey:@"removeEmptyFolders"])];
     [model deleteMarked];
 }
 
-- (IBAction)exportToXHTML:(id)sender
+- (void)exportToXHTML
 {
     NSString *exported = [model exportToXHTML];
     [[NSWorkspace sharedWorkspace] openFile:exported];
 }
 
-- (IBAction)filter:(id)sender
+- (void)filter
 {
     NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
     [model setEscapeFilterRegexp:!n2b([ud objectForKey:@"useRegexpFilter"])];
     [model applyFilter:[filterField stringValue]];
 }
 
-- (IBAction)focusOnFilterField:(id)sender
+- (void)focusOnFilterField
 {
     [[self window] makeFirstResponder:filterField];
 }
 
-- (IBAction)ignoreSelected:(id)sender
+- (void)ignoreSelected
 {
     [model addSelectedToIgnoreList];
 }
 
-- (IBAction)invokeCustomCommand:(id)sender
+- (void)invokeCustomCommand
 {
     [model invokeCustomCommand];
 }
 
-- (IBAction)markAll:(id)sender
+- (void)markAll
 {
     [model markAll];
 }
 
-- (IBAction)markInvert:(id)sender
+- (void)markInvert
 {
     [model markInvert];
 }
 
-- (IBAction)markNone:(id)sender
+- (void)markNone
 {
     [model markNone];
 }
 
-- (IBAction)markSelected:(id)sender
+- (void)markSelected
 {
     [model toggleSelectedMark];
 }
 
-- (IBAction)moveMarked:(id)sender
+- (void)moveMarked
 {
     NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
     [model setRemoveEmptyFolders:n2b([ud objectForKey:@"removeEmptyFolders"])];
@@ -205,7 +205,7 @@ http://www.hardcoded.net/licenses/bsd_license
     [model moveMarked];
 }
 
-- (IBAction)openClicked:(id)sender
+- (void)openClicked
 {
     if ([matches clickedRow] < 0) {
         return;
@@ -214,29 +214,29 @@ http://www.hardcoded.net/licenses/bsd_license
     [model openSelected];
 }
 
-- (IBAction)openSelected:(id)sender
+- (void)openSelected
 {
     [model openSelected];
 }
 
-- (IBAction)removeMarked:(id)sender
+- (void)removeMarked
 {
     [model removeMarked];
 }
 
-- (IBAction)removeSelected:(id)sender
+- (void)removeSelected
 {
     [model removeSelected];
 }
 
-- (IBAction)renameSelected:(id)sender
+- (void)renameSelected
 {
     NSInteger col = [matches columnWithIdentifier:@"0"];
     NSInteger row = [matches selectedRow];
     [matches editColumn:col row:row withEvent:[NSApp currentEvent] select:YES];
 }
 
-- (IBAction)reprioritizeResults:(id)sender
+- (void)reprioritizeResults
 {
     PrioritizeDialog *dlg = [[PrioritizeDialog alloc] initWithApp:model];
     NSInteger result = [NSApp runModalForWindow:[dlg window]];
@@ -247,17 +247,17 @@ http://www.hardcoded.net/licenses/bsd_license
     [[self window] makeKeyAndOrderFront:nil];
 }
 
-- (IBAction)resetColumnsToDefault:(id)sender
+- (void)resetColumnsToDefault
 {
     [[[table columns] model] resetToDefaults];
 }
 
-- (IBAction)revealSelected:(id)sender
+- (void)revealSelected
 {
     [model revealSelected];
 }
 
-- (IBAction)saveResults:(id)sender
+- (void)saveResults
 {
     NSSavePanel *sp = [NSSavePanel savePanel];
     [sp setCanCreateDirectories:YES];
@@ -269,7 +269,7 @@ http://www.hardcoded.net/licenses/bsd_license
     }
 }
 
-- (IBAction)startDuplicateScan:(id)sender
+- (void)startDuplicateScan
 {
     if ([model resultsAreModified]) {
         if ([Dialogs askYesNo:TR(@"You have unsaved results, do you really want to continue?")] == NSAlertSecondButtonReturn) // NO
@@ -279,37 +279,37 @@ http://www.hardcoded.net/licenses/bsd_license
     [model doScan];
 }
 
-- (IBAction)switchSelected:(id)sender
+- (void)switchSelected
 {
     [model makeSelectedReference];
 }
 
-- (IBAction)toggleColumn:(id)sender
+- (void)toggleColumn:(id)sender
 {
     NSMenuItem *mi = sender;
     BOOL checked = [[[table columns] model] toggleMenuItem:[mi tag]];
     [mi setState:checked ? NSOnState : NSOffState];
 }
 
-- (IBAction)toggleDetailsPanel:(id)sender
+- (void)toggleDetailsPanel
 {
     [[app detailsPanel] toggleVisibility];
     [self updateOptionSegments];
 }
 
-- (IBAction)toggleDelta:(id)sender
+- (void)toggleDelta
 {
     [table setDeltaValuesMode:![table deltaValuesMode]];
     [self updateOptionSegments];
 }
 
-- (IBAction)togglePowerMarker:(id)sender
+- (void)togglePowerMarker
 {
     [table setPowerMarkerMode:![table powerMarkerMode]];
     [self updateOptionSegments];
 }
 
-- (IBAction)toggleQuicklookPanel:(id)sender
+- (void)toggleQuicklookPanel
 {
     if ([QLPreviewPanel sharedPreviewPanelExists] && [[QLPreviewPanel sharedPreviewPanel] isVisible]) {
         [[QLPreviewPanel sharedPreviewPanel] orderOut:nil];
diff --git a/cocoa/base/ui/main_menu.py b/cocoa/base/ui/main_menu.py
index 679a52c1..d56fa2cf 100644
--- a/cocoa/base/ui/main_menu.py
+++ b/cocoa/base/ui/main_menu.py
@@ -27,45 +27,45 @@ appMenu.addItem("Quit dupeGuru", Action(NSApp, 'terminate:'), 'cmd+q')
 
 fileMenu.addItem("Load Results...", Action(None, 'loadResults'), 'cmd+o')
 owner.recentResultsMenu = fileMenu.addMenu("Load Recent Results")
-fileMenu.addItem("Save Results...", Action(None, 'saveResults:'), 'cmd+s')
-fileMenu.addItem("Export Results to XHTML", Action(None, 'exportToXHTML:'), 'cmd+shift+e')
+fileMenu.addItem("Save Results...", Action(None, 'saveResults'), 'cmd+s')
+fileMenu.addItem("Export Results to XHTML", Action(None, 'exportToXHTML'), 'cmd+shift+e')
 
-editMenu.addItem("Mark All", Action(None, 'markAll:'), 'cmd+a')
-editMenu.addItem("Mark None", Action(None, 'markNone:'), 'cmd+shift+a')
-editMenu.addItem("Invert Marking", Action(None, 'markInvert:'), 'cmd+alt+a')
-editMenu.addItem("Mark Selected", Action(None, 'markSelected:'), 'ctrl+cmd+a')
+editMenu.addItem("Mark All", Action(None, 'markAll'), 'cmd+a')
+editMenu.addItem("Mark None", Action(None, 'markNone'), 'cmd+shift+a')
+editMenu.addItem("Invert Marking", Action(None, 'markInvert'), 'cmd+alt+a')
+editMenu.addItem("Mark Selected", Action(None, 'markSelected'), 'ctrl+cmd+a')
 editMenu.addSeparator()
 editMenu.addItem("Cut", Action(None, 'cut:'), 'cmd+x')
 editMenu.addItem("Copy", Action(None, 'copy:'), 'cmd+c')
 editMenu.addItem("Paste", Action(None, 'paste:'), 'cmd+v')
 editMenu.addSeparator()
-editMenu.addItem("Filter Results...", Action(None, 'focusOnFilterField:'), 'cmd+alt+f')
+editMenu.addItem("Filter Results...", Action(None, 'focusOnFilterField'), 'cmd+alt+f')
 
 actionMenu.addItem("Start Duplicate Scan", Action(owner, 'startScanning'), 'cmd+d')
 actionMenu.addSeparator()
-actionMenu.addItem("Send Marked to Trash...", Action(None, 'trashMarked:'), 'cmd+t')
-actionMenu.addItem("Move Marked to...", Action(None, 'moveMarked:'), 'cmd+m')
-actionMenu.addItem("Copy Marked to...", Action(None, 'copyMarked:'), 'cmd+alt+m')
-actionMenu.addItem("Remove Marked from Results", Action(None, 'removeMarked:'), 'cmd+r')
-actionMenu.addItem("Re-Prioritize Results", Action(None, 'reprioritizeResults:'))
+actionMenu.addItem("Send Marked to Trash...", Action(None, 'trashMarked'), 'cmd+t')
+actionMenu.addItem("Move Marked to...", Action(None, 'moveMarked'), 'cmd+m')
+actionMenu.addItem("Copy Marked to...", Action(None, 'copyMarked'), 'cmd+alt+m')
+actionMenu.addItem("Remove Marked from Results", Action(None, 'removeMarked'), 'cmd+r')
+actionMenu.addItem("Re-Prioritize Results", Action(None, 'reprioritizeResults'))
 actionMenu.addSeparator()
-actionMenu.addItem("Remove Selected from Results", Action(None, 'removeSelected:'), 'cmd+backspace')
-actionMenu.addItem("Add Selected to Ignore List", Action(None, 'ignoreSelected:'), 'cmd+g')
-actionMenu.addItem("Make Selected Reference", Action(None, 'switchSelected:'), 'cmd+arrowup')
+actionMenu.addItem("Remove Selected from Results", Action(None, 'removeSelected'), 'cmd+backspace')
+actionMenu.addItem("Add Selected to Ignore List", Action(None, 'ignoreSelected'), 'cmd+g')
+actionMenu.addItem("Make Selected Reference", Action(None, 'switchSelected'), 'cmd+arrowup')
 actionMenu.addSeparator()
-actionMenu.addItem("Open Selected with Default Application", Action(None, 'openSelected:'), 'cmd+return')
-actionMenu.addItem("Reveal Selected in Finder", Action(None, 'revealSelected:'), 'cmd+alt+return')
-actionMenu.addItem("Invoke Custom Command", Action(None, 'invokeCustomCommand:'), 'cmd+shift+c')
-actionMenu.addItem("Rename Selected", Action(None, 'renameSelected:'))
+actionMenu.addItem("Open Selected with Default Application", Action(None, 'openSelected'), 'cmd+return')
+actionMenu.addItem("Reveal Selected in Finder", Action(None, 'revealSelected'), 'cmd+alt+return')
+actionMenu.addItem("Invoke Custom Command", Action(None, 'invokeCustomCommand'), 'cmd+shift+c')
+actionMenu.addItem("Rename Selected", Action(None, 'renameSelected'))
 
-modeMenu.addItem("Show Dupes Only", Action(None, 'togglePowerMarker:'), 'cmd+1')
-modeMenu.addItem("Show Delta Values", Action(None, 'toggleDelta:'), 'cmd+2')
+modeMenu.addItem("Show Dupes Only", Action(None, 'togglePowerMarker'), 'cmd+1')
+modeMenu.addItem("Show Delta Values", Action(None, 'toggleDelta'), 'cmd+2')
 
-windowMenu.addItem("Results Window", Action(owner, 'showResultWindow:'))
+windowMenu.addItem("Results Window", Action(owner, 'showResultWindow'))
 windowMenu.addItem("Folder Selection Window", Action(owner, 'showDirectoryWindow'))
 windowMenu.addItem("Ignore List", Action(owner, 'showIgnoreList'))
-windowMenu.addItem("Details Panel", Action(owner, 'toggleDetailsPanel'), 'cmd+i')
-windowMenu.addItem("Quick Look", Action(owner, 'toggleQuicklookPanel'), 'cmd+l')
+windowMenu.addItem("Details Panel", Action(None, 'toggleDetailsPanel'), 'cmd+i')
+windowMenu.addItem("Quick Look", Action(None, 'toggleQuicklookPanel'), 'cmd+l')
 windowMenu.addSeparator()
 windowMenu.addItem("Minimize", Action(None, 'performMinimize:'))
 windowMenu.addItem("Zoom", Action(None, 'performZoom:'))
diff --git a/cocoa/base/ui/result_window.py b/cocoa/base/ui/result_window.py
index e64bbf92..31eb06d9 100644
--- a/cocoa/base/ui/result_window.py
+++ b/cocoa/base/ui/result_window.py
@@ -26,7 +26,7 @@ item.image = 'NSActionTemplate'
 actionPopup.width = 44
 actionToolItem.view = actionPopup
 filterField = SearchField(None, "Filter")
-filterField.action = Action(owner, 'filter:')
+filterField.action = Action(owner, 'filter')
 filterField.sendsWholeSearchString = True
 filterToolItem.view = filterField
 filterToolItem.minSize = Size(80, 22)
@@ -35,7 +35,7 @@ quickLookButton = Button(None, "")
 quickLookButton.bezelStyle = const.NSTexturedRoundedBezelStyle
 quickLookButton.image = 'NSQuickLookTemplate'
 quickLookButton.width = 44
-quickLookButton.action = Action(owner, 'toggleQuicklookPanel:')
+quickLookButton.action = Action(owner, 'toggleQuicklookPanel')
 quicklookToolItem.view = quickLookButton
 optionsSegments = SegmentedControl(None)
 optionsSegments.segmentStyle = const.NSSegmentStyleCapsule
@@ -44,23 +44,23 @@ optionsSegments.font = Font(FontFamily.System, 11)
 optionsSegments.addSegment("Details", 57)
 optionsSegments.addSegment("Dupes Only", 82)
 optionsSegments.addSegment("Delta", 48)
-optionsSegments.action = Action(owner, 'changeOptions:')
+optionsSegments.action = Action(owner, 'changeOptions')
 optionsToolItem.view = optionsSegments
 
 # Popuplate menus
-actionPopup.menu.addItem("Send Marked to Trash...", action=Action(owner, 'trashMarked:'))
-actionPopup.menu.addItem("Move Marked to...", action=Action(owner, 'moveMarked:'))
-actionPopup.menu.addItem("Copy Marked to...", action=Action(owner, 'copyMarked:'))
-actionPopup.menu.addItem("Remove Marked from Results", action=Action(owner, 'removeMarked:'))
+actionPopup.menu.addItem("Send Marked to Trash...", action=Action(owner, 'trashMarked'))
+actionPopup.menu.addItem("Move Marked to...", action=Action(owner, 'moveMarked'))
+actionPopup.menu.addItem("Copy Marked to...", action=Action(owner, 'copyMarked'))
+actionPopup.menu.addItem("Remove Marked from Results", action=Action(owner, 'removeMarked'))
 actionPopup.menu.addSeparator()
 for menu in (actionPopup.menu, contextMenu):
-    menu.addItem("Remove Selected from Results", action=Action(owner, 'removeSelected:'))
-    menu.addItem("Add Selected to Ignore List", action=Action(owner, 'ignoreSelected:'))
-    menu.addItem("Make Selected Reference", action=Action(owner, 'switchSelected:'))
+    menu.addItem("Remove Selected from Results", action=Action(owner, 'removeSelected'))
+    menu.addItem("Add Selected to Ignore List", action=Action(owner, 'ignoreSelected'))
+    menu.addItem("Make Selected Reference", action=Action(owner, 'switchSelected'))
     menu.addSeparator()
-    menu.addItem("Open Selected with Default Application", action=Action(owner, 'openSelected:'))
-    menu.addItem("Reveal Selected in Finder", action=Action(owner, 'revealSelected:'))
-    menu.addItem("Rename Selected", action=Action(owner, 'renameSelected:'))
+    menu.addItem("Open Selected with Default Application", action=Action(owner, 'openSelected'))
+    menu.addItem("Reveal Selected in Finder", action=Action(owner, 'revealSelected'))
+    menu.addItem("Rename Selected", action=Action(owner, 'renameSelected'))
 
 # Doing connections
 owner.filterField = filterField