Step 4: Preparing A, B, X, Y, Start, Back, and Xbox buttons. Now, as far as I can tell, there is no common ground on this controller, so you will need two wires per button. Take the Dremel with wire wheel, set it to a low speed, and apply a gentle pressure to the black semi-circle for each button. This takes some practice to get the needed pressure and angle of the wire wheel right. Just be careful, and don't bare down too hard. Once you can see a good strip of copper where the black used to be, stop. After you finish the semi-circles, clean the area with alcohol and a Q-tip.