I noticed I have a damaged headbolt thread (7/16-14) on my block between #2 & #4 cylinder. I chased the threads with a tap and cleaned em up the best I can. I believe they will hold the 65ft/lb's they need to. They are just not as "sharp" as the other threads and I have a new bolt with perfect threads. This bolt had come loose before damaging the head gasket (it is why I have the head off). Should I just 1)go ahead don't worry about it, 2)use some thread locker on that thread, or 3)??. Anyway to fix this myself(I do not have a welder), without taking it somewhere, as I do not want to tow the entire car somwhere or pull the engine. Any such thing as a mobile thread repair service?