A hair drier will do a pretty good job of heating it and will not damage the nickel. Also try putting a properly-sized screwdriver bit in the slot and give it a sharp whack before trying to unscrew it. If you have a drill press you can also chuck up a screwdriver bit and block up the gun so that it will stay in place while you turn the bit with a small wrench.
Don't bother trying to loosen it with some sort of solvent, as the screw "caps" the hammer stud. The only way you're going to get a solvent in there is to soak the entire gun as Ed suggested.
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Peter #2091
Last edited by Dosgatos; 04-18-2012 at 12:29 PM.
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