how do the swinging sticks on pepper pots desk in iron man two work?

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David W

New member
In the movie iron man 2 on pepper pots desk is a sort of pendulum motion machine. These are called swinging sticks. If you look up swinging sticks you find one site on think geek that sells these for over 200 $. That seemed a little expensive so i would like to know how they work or even better how to to make them.

http://www.youtube.com/watch?v=m7N59Ma98UM
 
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