I recently bought some Great Planes thread locker. It's the blue stuff, and it says on the bottle removable. I hope that is the case.
On my OS Max LA 40, a wonderful reliable economical little engine, the back plate the needle valve is mounted on kept coming loose until I applied some thread lock. Everytime it came loose, I had to remove the engine from the plane, a very tiring job!
Now I never expect to have a need to remove the back plate bracket, but if I do, will it come off? I read someplace that aluminum threads strip out quite easily when thread lock is used.