Here's my pure guess.... they were never tight from the factory? My guess is the screw is into metal (steel or aluminum). Even if you have to use pliers or vice grips on the screw head, remove the "stuck" screw. Replace the screw with like size self drill/tapping screw. If the screw head breaks off, you just have to drill out the broke screw.
Mark
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2021 Precept 34G, Brevard, NC
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