If it's a 1/4 x 28 and not the 6.1 mm.( it's 1/64th bigger if i remember right) then it just might be dirty enough to offer resistance. I would double check and make sure of the size though . Maybe clean it out and try threading it again.
Last edited by 1874sharpsshooter; 07-23-2012 at 07:33 AM.