Hi James, your thread title really piqued my interest, turns out it has nothing to do with you abusing a certain world-class Olympic sprinter.
It's a long time since I've had to deal with this sort of thing, but I seem to remember buying a tool which you screw into the end of the bolt after drilling into the back of it first, then you clamp some mole grips onto the tool and it brings out the bolt with it. It may have been called a stud extractor, was about the size of a nail punch and it didn't cost much.
I just dropped in, to see what condition my condition was in
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