Redoing the master and wheel cylinders on my 53 Chev 2ton COE. Three corners out of four went without a hitch, but of course the last won't. It's the driver's side rear and the drum is not cooperating at all. I have removed the three screws and attempted to loosen both star wheels. I say attempted because, for some reason as I adjust in one direction or the other, the shoe seems to get looser, but as I keep going it will tighten up again. Going back to where it seems the most free and banging on it as nicely as I can just doesn't seem to be getting it. I have opened the bleeder on the front cylinder and loosened the line on the back. Still stuck. Any ideas would be greatly appreciated.