The "number 2" yoke screw had a slightly larger diameter unthreaded stem on the end. This larger stem would take up the gage caused by wear on the inside of the yoke button, and would sometimes fix end shake on the yoke without the need to peen the yoke button. (The term end shake can be used to describe the condition caused by excess gage on the yoke button, where it interfaces with the yoke retaining screw, "end shake yoke" and also refers to excess gage on the end of the barrel of the yoke ...... "end shake cylinder" where it interfaces with the back, interior of the cylinder.)
The new yoke, and retaining screw design has basically "eliminated" the need for the screws that do not have the integrated, spring loaded plunger.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 07-15-2017 at 11:17 AM.
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