I'm searching for a mechanism (or a design to make it myself) so that my little wheel can turn as in this photo
http://img92.imageshack.us/img92/9236/img9727ao1.jpg
(sorry I don't know how to put this picture here)
thanks
http://img92.imageshack.us/img92/9236/img9727ao1.jpg
(sorry I don't know how to put this picture here)
thanks