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drill a proper hole for an easy out, then before you attempt to twist it out with the extractor heat up the plug and surrounding area with a torch. Propane or map gas will suffice. Once hot it should come out easy. If not then shock cool it with a spray of water and try heating it up again. The hot cold cycle may break it loose enough to remove. If it wont come out at all drill and retap 1/2 npt. You may need to make a guide out of 1/4 steel as a guide to keep the drill bit centered.
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