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You are correct. While it might be more fun to engineer a chain drive, It would more than likely be a total headache to implement it. Simpler is usually better. I'll go with a couple of these little DC gearmotors instead. http://www.surplu...e=electric
That simplifies things considerably while also decreasing the size of the base.
As you can see here:



I'll start scrounging around for parts this weekend.

Russ