Jared another option is to weld the key onto the axle, or weld the sides of the keyway up and then file it back so the key fits nicely. All these things can be done just depends on what works best for you. Ok so this push button switch you have, does it only have 2 light wires coming out of it or does it have 2 nuts on it that the battery cables connect to. Starter motor bolts directly to the body, no insulation. What makes you think the starter is shorting out? Another alternative for the wheel might be to get a piece of thin wall 1" inch tube, slot it down the middle so you can roll it into a taper that will fit snug on the axle taper then cut/file a section out so you can hold the key in position so you can get the wheel tightened up. Plenty of ways to fix it just depends on what you can do and what tools you have available
