My gunsmith removed the grip, and tried to loosen the screw you mention. It was extremely tight. He took the gun to the back room where his shop and tools are, and did "something" with it. The next day it did the same thing once, after he worked on it, so I'm not sure that it's "fixed".
I never use that safety. I would prefer to disable it, or move it so far that nothing can lock up the gun. It's only a Bullseye gun. It never gets used for anything else.
I took the grip off that night after I tested it at the range, moved the safety lever as far down as it would go, and re-installed the grip. I'll find out at tomorrow's match if it's really fixed. I'm not all that confident about it, but at least now I know what is causing the problem.
Not sure which gun to use at the match tomorrow, the 41 or my High Standard. I used to have problems with my High Standard, but that turned out to be that someone put the magazine spring in incorrectly. Alan pointed that out, but I couldn't figure out how to disassemble the High Standard magazine until just a few days ago. IF (and that's a big IF), the 41 is now fixed, I feel more comfortable shooting it, but for reasons I don't understand, I'm a little more accurate with the High Standard.
Thanks for the suggestion. I have a feeling there is more to the safety than just locking the slide. I suspect it does something to the firing mechanism to block it, so the gun can't fire. My gut feeling is that's where the real problem is, but I don't want to start taking things apart that I don't understand.