I had a broken bolt in one of the oil filter's cover holes. A friend of mine told me he knew how to remove it and ended up demaging the house/hole with a drill!!! He removed it, but now the hole is bigger and very irregular. I tried a few different bolts but I can't find any to make it work, they won't fit. Is there any way to fix this or will I need to replace the whole engine cover because of that? Please, help me!!! Thanks!