I foregot I had this lying around. Its from an old toy [sm=regular_smile.gif]
The Idea is that the torsion spring (like a servo saver) takes the force but this one also centres it.
Video:
[youtube]http://www.youtube.com/watch?v=wu0tLuOUOxw[/youtube]
(Sorry for the blurry pics and video)
This used to be wired into a spaghetti junctions of wires ect.