Model Engine Knob

thingiverse

I've replaced the motor with this small knob, which would normally house the engine's motor for this particular model. To be honest, I found the motor to be quite annoying and less enjoyable than manually turning the crank. The spark plugs still function since they can be connected independently of the motor. I used a Discovery model, and as long as the crankshaft has a 6.5mm square end on it, this should work fine.