I've broken 2 3/8" drive 9/16" sockets (6-point) trying to get this oil drain plug to come out. It's a brass replacement plug from Geno's garage. I have never had a problem with it in the past, always used the torque wrench when tightening it. But it won't come out! Any suggestions? I have the standard Cummins washer under it. I'm off to get a 1/2" drive 6-point socket to try next, but I'm very afraid of shearing the head off of the plug.