The Whitworth tap for Luger grip screws is not obsolete. There seems to be enough help provided to make a purchase, if not I will see if I can find my data for the right tap. But a little tip to help: If one side of frame hole is O.K. start the tap from that side and go through the mag well into the damaged side (after applying a drop of oil, of course) and re-thread the side needing straightened out. Slow and easy is a key.
Jack
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