I had that very same problem with a 20ga 11-87. I stumbled across a fellow in Michigan that had everything I needed. I'll try to find his info again and pass it along. He was (at one time) a gunsmith for Remington and ended up buying a big load of parts from them when they went under. I actually sent him a picture of the old part and he said it was junk from the beginning and what he sent me didn't look the same but worked a lot better. the old part had a big slot cut out and the new one was solid all the way around.