[Gunner]

I do want to be able to remove it to swap on the OEM knob for show. I also want it to stay tight under my hand. Loctite would be a good choice for more permanent mounting but I'm afraid it would cause problems with frequent removal.

Tcrist, I have an excellent selection of jam nuts locally but they (and everything I see in McMaster) are hex nuts. I'd like to find a "beauty" nut with a smooth or knurled outside if I can. I'll fab something up when I can get to my bench tools. The tapped chrome washer would have been aces if I could have gotten a clean tap on it.