Terry,
About a year ago, I had some auto wheel spacers shaved at the shop linked below in Costa Mesa. I was pretty impressed by the shop, and the owner, John, sounded quite competent. Opening the cases should be very straight forward for him.
Costa Mesa R&D
Whatever you do, don't go to the place that Champion recommends, some place up off of Kraemer in Anaheim, which, if I remember, is named D & R Machine.