[Fusion_Clint]

Originally Posted by pilleya

Unfortunately Andymark does not sell 18 tooth steel gears with a 1/2 inch hex bore.

While the final stage gears might not be able to take the stall torque generated by the 775's, the ratchet means that the motors should never need to be be stalled.

They do sell this 19 tooth one, which I bet would also work.

http://www.andymark.com/Gear-p/am-0176.htm

We wound up using one of these paired with a this mecastercarr gear that we machined the bore ourselves. http://www.mcmaster.com/#6325k73/=11up3mm

Just trying to help.

It wasn't our first choice, but is nice not breaking teeth every other match.