I had a broken ARP connecting rod bolt In my ls3 and mechanic 3 cobalt bits were used which refused to work and broke. Lost hope but found the carbide should bite the bow bolt. A shot in the dark on this subject and IT TURNS INTO A BOLT! I would say this is the best moment in the world lol! It worked. Have him make a hole and then use the cobalt tip on his left hand to pull it out.