I've changed the shape of the balls and increased the length of the hangers. The centre ball is moved by a small lever on the base - can't see it on this picture! I'll do a video when it is complete. Just need to add colour now.
Thanks to Ed Eckel who pointed out that the cardboard version is the non-elastic version whereas the metal version is an elastic collision - fancy getting it the wrong way round! The shame of it!
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