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I did this recently. I feel your pain. Use a screw extractor. You can also use a left hand turn drill bit to drill into the broken stud and possibly luck out and unscrew it.
If you drill a hole in to the broken bolt for an extractor, make sure it's straight in...perpendicular. I think most machinists/machine shops have tools and experience getting things like this out.
Good thing is the bolt remains in the hole probably aren't seized up or anything, it's just that you broke the head off. So, it should be able to turn out of there. I would definitely try the cut slot/use screwdriver trick first.
FYI those bolts are really low torque, it's inch-pounds.
I used a hammer and a chisel to remove the bolt! Super easy to remove!
Also what happened was I glanced and saw the torque spec but did not double check to see if it was in in-lbs or ft-lbs.... for some reason my brain was like "ft-lbs go with ft-lbs"
Last edited by Moe Greene; Jun 10, 2017 at 08:54 PM.