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If you have to drill , remember these screws are Grade 5 or 8 and fairly hard. Use a cobalt drill bit and a slow drill speed. Air-powered drills are way too fast nd will only burn up the drill bit.
I generally go in with a 3/32 pilot drill first. It will walk less and go straighter. Go slow , use oil. Then open it up with a 9/64 or 5/32 , whichever your screw extractor calls for.
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