Cool tool. Thanks. Getting closer. Using "tamper proof" produced lots of results, including a variety of 5/16 hex size. But the tamper pin on the screw is not very long, so the hole in the hex is not very deep. The center needs to be drilled thru, to slide over the 3/16 switch shaft diameter. There is a hole, already centered, that could be enlarged. But can this hex bit material be drilled? Various tools in that size range from $8-$14. My investment for a 5/16 hex coupling was $1.49, and easy to drill the center hole. It works. Plus it's a tool that has only one application, to remove 5 bezels. It will never be used again. It seems this hex bezel design was only used on '49 - '50 Chrysler. (not all Mopar for those years). I'm happy to provide the discussion regarding a tool. It will go into the archives, and perhaps someone in the future will find it via a search, giving them the tip they need for a solution to a problem. With this "oddball" '49, sometimes it feels like I'm talking to myself here, but again the facts/tricks/tips may be useful to someone else.