Oh, they didn't thread the hole in the mud ring, ah who cares. (Tacka, Tacka, Tacka, Tacka!) Even make threaders that fit 1/4" hex, not that youll need it after melting the threads off a #6 screw into a #6 rivit.
LOL.
Nah that never happens, but if it did it would be easy to get out....right?
Bob Badger Construction & Maintenance Electrician Massachusetts