Hey Mike, I would simply glue the piece back in place, without filling the hole. Clean with brake cleaner and a wire brush (and I mean clean the s*** out of it! Get the oil flushed out of the pores of the metal!!!) Use the original JB weld, not the quick stuff, and let it set up for a least 24 hours before screwing in a bolt, to make sure you don't glue the bolt in.