well, with the trackball holes and the joystick holes, don't you need to take a much more precise approach. i've always heard that you router out a small circle around your joystick hole on your cp panel, insert your dust washer, and then put your cpo over the top of that...so wouldn't you need to find the center, drill and router, then cut a perfect circle out with an exacto knife, and then glue down your cpo over the dust washer in the routered hole....i hope that all makes sense, and hopefuly someone else backs me up on this one.
it makes sense since you never see that dust washer on commercial games.