How did they try to fix it? Just a plain helicoil ?
Nice thread here. I find the taps have a centering dimple on the end near the square. Using the tailstock and a center of some sort I have tapped similar holes with the tap held square and eliminating the step with the soft metal blocks in the vice. Sort of similar to the other taping operation in the drill press/vertical mill which a center could be used in a sort of similar fashion.
Not sure about the stud extractor reference is that grabbing the stud inside the socket picture in post #13
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