Need some advice. In stripping down the front axle on a 1994 Defender, I sheared the head off of one of the M10 double hex bolts. Three others would not budge, so I cut the heads off to get the swivel ball and stub axle off. I have soaked all in PB Blaster, heated, etc. and tried to get them off with a stud extractor - no luck. On the sheared bolt, I was going to drill and use an EZ out, but promptly broke off the drill bit. I'm stuck. Any suggestions?