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I've already figured out how to solve the problem. The bottom motor will be given the freewheel from the top motor.
The two motors will then be linked by 11-tooth #35 sprockets which I will have to drill and tap so that they screw onto the end of the drive shafts in place of the hex nuts.
Since the motors are rotating Counter-Clockwise and the thread is right handed they will automatically tighten the sprockets onto the shafts. But if they slip I'll just have to weld them in place.
All of the above will require a new motor mount plate, or a revision of the existing one. But it will involve fewer parts and will only cost me $40 to make the changes.
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