Oh yea....and remember that it is reverse threaded. So it not lefty losie, rightie tighty; but the other way around.
Don't ask me how I found out.
Dremel with a fiber wheel, then jewelers files to dress up the FSB, then cold bluing.
I got mine off, no problem.
Best thing to remember is not to worry about the hurting the nut, just worry about not hitting the threads.