Deleting changes made to default bundles in TextMate

From the Help file:

If you want to discard local changes then currently the only option is to delete these from ~/Library/Application Support/TextMate/Bundles.

Of course, you can also just drag them out of that folder in case you want to add them back later. I created a folder called DeltedChanges within ~/Library/Application Support/TextMate/Bundles.