Re: Get an impact screwdriver like they use on motorcycles
Go to a more serious penetrating oil than WD40. WD40 is a water displacer, it dries to a sticky film when left for a couple of days. Try "Breakfree" or, if there is an aviation store around you there is an aviation product called "Mouse Milk" that is incredible when left to sit a couple of days. I have never used an impact screwdriver but would bet that John's advice is solid. Be sure to remove all oil from the screw head and slot area so you do not slip.
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