Danger!

This idea began with Shawn form One Drop putting three inch long rubber bits into the nut capture of a Project as a joke during prototyping. We called it the Whisker mod, or French tickler. I took those bits and pushed them through the yo-yo, so light would come through, and the nut retention system and the response system could be one and the same.
More pics at http://flickr.com/photos/13549868@N03/