I'm in the lighting repair business --shopping center and such pole lights If all goes well we only need to service a fixture every 3-5 yrs and have found a old electrician wire lube (slip stick) made from bees wax to work remarkably well for getting the screws loose after going thru numerous heating and cooling cycles . Boss asked me yrs ago what the hell I was doing with it all --told him and he tried it on his boat found it worked better than anti seize on every thing from the prop shaft up! I think 3m is now making a product know as well
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