Ron:
As other say, do yourself a favour and find/study the proper disassembly procedure for a Parker. Warning... it is NOT as easy as a standard boxlock to take down. In fact, it's a royal pain in the arse. If you consider yourself "not a gunsmith," it might be worth $50 to have a good gunsmith take your gun to bits for you.
Regards the "screws"... They should probably be soaked in Kroil for days before any attempt is made to move them. And only then if the slots have been thoroughly cleaned out first, and perfectly fitting turnscrews used. These guns are almost always clogged with rust and old grease. And a buggered screw is one BIG problem.
Best to go slowly... and learn some gunsmithing technique as you go along. Read books and study much... then apply the knowledge with care.
Best, Kensal
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