Originally Posted by
southpawboston
Nice idea. I think you were referring to BB cups, not the shell. I have a ton of old BB cups lying around. I can file flutes around the threads like those on a tap (though the cups are all hardened steel-- could be tough). I'll give that a try.
Yes I must admit ignorance may have caused me to use the wrong term :-).
I have done this with a bolt in the last when I did not have a proper sized tap to clean out a thread, it is not hardened so will not work nearly well as a tap, but the "flutes" let it scrape "stuff" out of the threads somewhat anyway :-).
Oops I see the cups ARE hardened, so maybe it is dremel or bench grinder time :-).
Bill