I tried turning it; the base of the switch cover has a small notch at 9 o'clock that fits a ridge on the housing of the ignition/lock housing that prevents turning the cover. It appears the only way to remove the cover is to find out how to release whatever holds it on the assembly. My fear is that something on the tumbler releases the pins/locks/ears/whatever and that I'm SOL. I will spend some more time looking at it; otherwise I'll call the dealer in the morning. Appreciate the quick response.