broken bleed nipple
This is a method for removing broken studs in blind holes that i have used with great success. Place a thick penny washer with a hole in it the same diameter as the broken stud over the remains of the stud, get the mig welder out and blast through the hole and stick the washer to the stud. You can then stick a decent size nut to the washer and just undo it. This somtimes takes a couple of goes but it has never failed me , it has worked on massive bolts on heavy plant track frames down to small studs in ali cases. I think it must be the heat from the welding that makes the stud let go but always seems to work. As for the damaged thread i could only think of a helicoil as you dont want to damage the taper seat.
Bob
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