http://www.youtube.com/watch?v=4QsjmuY_CP0
They're using wound up surgical tubing. The grooves force the ball to the center. This is basically what we're trying to do, but we were trying to do it more of a physical way. Although, I'm not sure how that thing would respond to a moving robot.
We could just etch grooves into the unobtanium, but maybe this is something we can play with on Logan's roller. I don't exactly wanna etch up a $70+ piece of rubber.
- Sunny

