http://fly.hiwaay.net/~palmer/motor.html In step 2, it says Why we should remove the insulation from one side of the wire while to sand off the insulation from the top half of the other end of the wire? What if we remove all the insulation from both ends of the wire? And what happen if we remove all the insulation of the wire? By Flemming's left hand rule, we can work out the polarity of the magnet used. I've made this motor before, it's easy to make, and pretty cool!