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You can use the head as a drilling guide to keep the stud perpendicular to the block. The rough hole in the head is close (oversize) to the drill bit required for a 7/16" NC Helicoil. Drill the hole being careful to only go as deep as the existing hole. Blow the cuttings out of the hole and then remove the head to tap the hole. The head will keep drill bit cuttings from getting in the cylinders. Seems daunting …until you try it. It is not that hard.
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