> I bought the best quality reverse thread taper type
> extractor I could find.
Think I missed the original post ... I have never, ever, had any luck using
the tapered extractors. If you think about it, the taper will wedge the
bolt/stud tighter into the hole and the extractor has to have a smaller
cross-section than the bolt had, so it will snap easier (or just as easy if
it's much higher tensile than the original bolt).
My best luck so far has been with drilling in stages to the minor diameter
of the threads, then picking out the remaining pieces with a dental pick.
If that doesn't work, there's always Helicoils ...
One of these days I've just got to build an EDM.
Randall
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