How to loosen stuck plastic/nylon thumb screw?

100LL

Member
I could really use some reef safe remedies for loosening a couple of plastic thumb screws in my sump that are torquing and not backing out.

Any feedback is appreciated.
 

100LL

Member
Not a great way to spend two hours of my day off, but probably like many of you I have a personality that won't let me give up! I drained the sump and used some strait vinegar as lube and needle nose vice-grip and carefully got em out without torquing the heads off... Phew!

 
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