I have an older model Thompson Center Black Diamond with a wood stock. I noticed recently that after 3 shots I am unable to cock the action. Close investigation showed that the trigger/ barrel appears to have moved slightly to the rear of the trigger tang. In order to cock the gun after 3 shots I have to loosen the 2 screws that secure the trigger tang to the stock and barrel. I can then slide the barrel with attached trigger forward approximately 1/16 inch and then it works as it is supposed to. I tighten the 2 screws and after a couple shots the same thing happens. I took the barrel out of the stock and it looks like there has been some wear in the wood stock on the rear side of the trigger tang. Any ideas on building up that rear spot where the trigger butts up to the stock? I tighten the 2 screws but the recoil seems to allow the barrel with attached trigger to slide back slightly and can see where the trigger actually has contacted the back side of the trigger tang. On the last shot before it won't cock the trigger is hard to pull since the creep distance is less because it is so close to the back of the tang.