Originally Posted by
Willbird
If you have an old BB shell and a bench grinder you can probably grind some grooves into to to make a sort of tap to clean the threads out ??
Have a look at a tap to see how the flutes are ground, and try to duplicate that to some degree, you could probably use a Mill bastard Nicholson file too if you do not have a hand grinder with a cutoff wheel or a bench grinder.
Bill
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.