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Alright, cobalt bits are NOT the way to go. You need to get a carbide tipped masonry bit. The steel shaft will allow it to flex some and not chip so easily. You will still need to be careful not to let it chatter.
Another option is that they well bits for the dremel tool that have ground up diamond on the outside. That will grind away the easy out.
Like Enes said, left hand drills should be the first option to get out a dead bolt/stud. Don't go straight to the easy out, that should be one of the last options.
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Is burning corn and stayin' warm!
My motorcycle is stock and reliable, my Talon is neither!
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