I have it home and am cleaning it up. I test fired it yesterday and put a dozen rounds through it. It's a sweet and very light shooter.

Anyway, I'm having a problem removing the large top side plate screw. The head is already a bit buggered up and I don't want to make it worse. I've been drowning it in penetrating fluid, but it won't budge. I thought about heating it, but I'm afraid that it would mess up the nickel finish. I'd like to get the innards cleaned up and lubricated. Any suggestions?