A question for you old timers. Im trying to resurect an old RC-10 Gold pan for my grandkids. It has the stock resistor speed control. Way back in the day I faintly remember a simple mod to provide reverse with that unit. With the grandkids running it in the drivewa/street reverse would be a big help. Anybody remember what the wiring diagram looked like or for that matter where one might find info on this mod?