Hi,
your project is very intresting.
Just i don't understand how you can put diff cups on both side of this motor ?!??!
Output shaft is on one side only.....
There is a way to get the shaft to come out on both sides. You need to take the motor apart and slide the shaft down, you also need to make a new flatened space on the shaft for the grub screw to grip onto. You can also use a prop adapter, but I will not be doing it that way.
You can ask Takedown for more info on that procedure.