I see people talking about locktite and all these thread goops and i always seem ro forget to mention this but i was just reminded cause i was working on my remington that has always had a screw that backs out on the hammer. Take a short piece of fishing line and run it down the hole run the screw in and trim off the excess sticking out. Volia no locktite ya have to go broke on and no peening threads or other such silliness.