Hayward skimmer plate hard to turn and lift off

You're referring to the round skimmer cover plate on the decking correct? If so, and assuming you've tried the standard cleaning of the skimmer mating area and the lid itself, you might try gently rubbing the lid mating surface (lip area) with some fine 600-1000 grit wet/dry sandpaper. Very gently go around that edge and that may be all you need to help it slip back down easily.
 
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