I'm in the process of pulling the drive plate off a vehicle to replace the rear main seal. In the process of loosening the 10 bolts, I managed to bugger up the heads on two of them. The socket I was using slipped off and rounded off a couple of shoulders on the bold head.
When this happened, I stopped screwing with them in order to minimize further damage. There are several methods for removing such bolts. Prior to drilling and seriously messing around, I seem to recall some special damaged bolt sockets (with helical teeth in them). What are these called? Are they any good (the bolts are 14 mm, torque to 75 ft-lbs). Who would carry them in the Seattle area? Any tips when using these? Or other advice?