Tight HOB Skimmer Collection Cup

[schnebbles]

My HOB reef octopus skimmer cup is so tight (w/out the set screw) that I can barely get it in/out. Right now I couldn't even get it as low as I want it.

Any suggestions? I guess it has to do with it being warm? IDK though, it's not hot or anything. Strange but really annoying when I have to clean it about every other day.