I had the same problem, so I counter-sunk from the back of the dash an area wide enough for the switch or whatever to clear, and deep enough (from the rear) to leave 1/8" - 3/16" thickness for the switch. It's been a while, but I believe that I used a rasp bit in a Dremel with the Dremel attachment used for setting depth for removing grout from ceramic tile. Get your depth set, draw a circle around the hole with a Sharpie as a guide and have at it.