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Not sure I would trust a drill to track straight. Small end mill, maybe. Left-hand is a good approach, regardless. A square easy-out that small might be hard to find, but worth a search. The spiral ones tend to tighten the fit as they go in, but you can control the square ones' distortion better.
If you 'mill good', you can pick out the thread leftovers with a dental pic and you're good to go.
What size end mill would one use to mill out a #6 screw? I would worry about breaking the cutting tool.
If in good shape you might take it to a good gunsmith .. don't know the current cost of drilling out a screw.
Yes to start soaking it with something (Qt:Tech Ted)..WD or better.
Avoid WD-40 on oxide finishes it will discolor the finish.
That's what I was thinking. It's easy to assume the screw is stuck when it's not.If the screw was broken without being bottomed and is actually loose in the hole an air powered engraver will often walk the screw out quickly. Electrics need not apply.
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