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I'm going to make a suggestion and say that a DOUBLE SIDED timing belt has a LOWER coefficient of friction, meaning that there is little resistance to movement. As for using a SINGLE sided timing belt (Can't remember the company that sells these, but...) they type they sell actually has a HIGHER coefficient of friction. It is also EXTREMELY hard to find double sided belts. (I should know, our team is kida looking for them but may go with single sided).
The gearing....he's right about that part.
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