Originally Posted by Gordon Johnson
Other than Didel you will have to make them. There might be some other source like Larry Park, but I'm not aware of anyone listing them for sale. Since the SS 7mm motors can't be bought at wholesale, there is little reason for someone to develop a gearbox so they can sell a complete propulsion system. It could happen, but hasn't yet.
What about Plantraco? They have a 7mm gearbox/motor combo and seperate 7mm SS motors.