I would not use rubber on this one. It is very expensive. You could use the force or make a "balance weight"-device - go to http://www.armadillorun.com/solutions/ and download solutions to see what people ar doing.
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I totally agree with not using the force. As much fun as it is to watch in action, I think its a little bit of a cheap manipulation of what is for all intents and purposes a physics glitch.