I find no screws behind the switch. There is a large spring that if you push from behind the switch, the chrome bezel comes thru the front of the dash to reveal a smooth round part of the bezel. It apears like it should turn to unlock it from the body of the switch, but no flats are on this round area. The bezel has acc, off and start, but no hole for a pin release in the tumbler area. I have not seen one like this.
