Index: lib/hotcocoa/mappings/toolbar.rb
===================================================================
--- lib/hotcocoa/mappings/toolbar.rb	(revision 1829)
+++ lib/hotcocoa/mappings/toolbar.rb	(working copy)
@@ -51,11 +51,12 @@
       def build_custom_items
         if @allowed && @default
           ary = @default.select { |x| x.is_a?(NSToolbarItem) }
-          @default -= ary
+          
+          @default.map! { |x| x.is_a?(NSToolbarItem) ? x.itemIdentifier : x }
+          @allowed.map! { |x| x.is_a?(NSToolbarItem) ? x.itemIdentifier : x }
+
           @custom_items = {}
           ary.each { |x| @custom_items[x.itemIdentifier] = x } 
-          @allowed.concat(@custom_items.keys)
-          @default.concat(@custom_items.keys)
 
           [@allowed, @default].each do |a|
             a.map! do |i|