Boss has the snap on kit to repair bad/broken plug holes, I've done a few- so far so good- but if you soak them a day or two ahead of time usually no problem at all-break loose, tighten, back off, tighten, etc., etc-usually out half turn back in 1/4 add more kroil/pb/acetone-atf/penetrant of your choice as needed. Crank engine over to blow out any extra oil if needed.
problem is the crappy plug design, threads are crimped onto rest of plug.
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