I bought a 1/2 unf adapter for a crosman barrel, but it's just a teeny tiny bit too small to fit over the barrel. I've tried shoving it on with some force and it's not going to happen. I'd still like to use this if I can. Any ideas how I can sand down the inside of the adapter a hair in a uniform way? I don't have a drill bit thats 11 mm either.
Thanks!
Thanks!