There is a tool called an "easy-out" that is used by center drilling the
busted bolt/stud with an hole that is appropriate for the easy-ouot to bite
into. (they come is various sizes).
You drill half and inch deep or so and insert the easy-out into the center
drilled hole and, while pushing it down you torque it counter clock wise to
back out the busted part.
The easy-out has an appearance of a four or five splined shaft that has
been twisted counterclock wise a turn or two and is tapered rather severely
over its inch or two lenght.(or think of a twisted, tapered ream)
The twisted spline corners bite into the hole you drilled and POOF you back
out the stubborn part.
Any machinist would have one as would a tool supply shop.
Regards,
Jim Parent
B9470139
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