I am trying to install a new shower head but the old one is stuck. I've removed the shower head itself but there is a ball nut that allowed the shower head to swivel attached to the pipe from the wall that will not come off. I have tried WD-40 but it will not come off. The shower head was installed in the early to late 70's. It looks as though the ball is a complete second piece, but is it a part of the pipe? Does this ball come off at all or do I have to cut the pipe and go from there? Help!