If the recoil plate bedding area is in question, you would normally build it up with bedding compound. If the wood there is rotten/mushy, you first have to soak in a wood hardener. I actually use thin, watery Super Glue. Once the area turns to stone, then you have a base for the build-up. This job involves coating the back of the recoil plate in release compound, setting the recoil plate and removing it later - or not. I'm having trouble imagining how it could be 1/8" off and the screw still hits the hole.