Hi,
Our CIMULATORS & RS775’s just came in today.
The Banebots site said that the cimulator accepts two motors, however all the ones we got only have one hole…
How would we modify it to take two?
The CIMULATOR that accepts 2 motors is the CIMULATOR for the RS-550 the RS-775 CIMULATOR only takes 1 motor. To my knowledge, it’d be near impossible to modify the 775 one to take two 775s, I don’t even think you could fit another one on the CIMULATOR mounting plate 
I wonder if one could use the AM gearbox designed for FPs on BB motors… other than motor shaft length, the motors are the same interface wise…
It is possible.
We did this for one of our motor-gearbox sets on our robot for this season.