Install the Disc/Hex drive onto your RC and install the wheel over it. Again you may have to try a few positions for the parts and the HEX to fit.
Before powering up and running your RC spin the wheel by hand to make sure nothing is rubbing or touching. If it spin freely then Power it up by flicking the switch and give her a spin to see the effect. Once tested and everything seems fine try it with the Remote.
Remember This instructable is for one disc. You need to make four in all.
at no time during construction should the 2 sides of the batteries touch. Not only will they get hot but they will drain very quickly leaving you with a dead cell. Also keeping the battery in your hand or between fingers can drain it as well. If you have any, use common sense. If you don't then maybe you shouldn't be toying around with hot irons. the idea here is to have fun and save TONS of money.