Mike, try some PB Blaster - there are several different types of product - penetrant, anti-seize, lubricant, rust remover, etc. I used the penetrant to loosen the hinge pins on my new Fox Pin Gun. The screw slots were cocked up at odd angles from the horizontal and were super tight, so I douched each one with PB and left them sit overnight. Next day they rotated out with minimal hand torque. Great stuff - I've used it for years on super-rusted nuts & bolts on outdoor equipment. The key to success is letting it sit and seep in.
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