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WD40 is NOT penetrating oil (mostly solvents that evaporate quickly). If it doesn't work get some real penetrating oil and let it soak at least overnight, then try again. Be patient, more oil and overnight again. Heat from a heat gun, hair dryers dont get that hot, might help (different expansion rates for the plug and head). also tapping the wrench with a hammer as you apply trorque might help.
Good luck, Carl C.
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