I assume you are talking about the yoke screw? That's the first round headed plate screw that, when removed, allows you to remove the yoke and cylinder. Anyway, your problem sounds like a loose sear pin in the trigger and its easy to check and fix. Remove the side plate ( keep the yoke screw separate as it is a fitted screw). Look at the inside of the side plate for witness or rub marks by the trigger stud hole. Remove the trigger and also check the frame side for witness marks as well. It will appear as a arc or radius scratch. That indicates that one of the sear pins in the trigger is loose. Its an easy fix. Using a small drift or punch, drift that sear pin out slightly (about 1/8") and then put the pin, while still in the trigger, in a vise and gently squeeze the pin to elongate it and then tap it back in the trigger. Make sure that all sear pins are flush. That will correct your problem. As long as you have the gun disassembled, clean with a solvent, dry it and reassemble. Before putting the side plate on, put one drop of oil on the trigger stud, hammer stud and stop stud and reassemble. Its real easy and will save you big bucks.
Bob St.George
Chief Armorer Inst. S&W (RET.)
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