Hayward pump cover difficult to remove

One trick I have used in the past is to loosen the lid while the pump is running. Sometimes this will work.

The other option is a strap wrench but I am not sure that would work on that lid.

Last resort, use a rubber mallet to "gently" loosen the lid.
 
I have a Hayward TriStar and struggle to get the lid on and off. It's 1 year old so brand new, If I just hand tighten it seems to have air bubbles, if I give it some oomph to tighten then I can't get it back off. I am buying a rubber mallet today on my way home. I tried to get it off last night and I slipped took off the tip of my pinky and most of the nail. Should have went with the Super Pump, that lid is gold standard!
 
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