Smith and Wesson will have the "newer" yoke revision screws in stock. You could give them a call. They would probably send you one free, if you explain the circumstances. No fitting required on this screw.

1-800-331-0852 ask for the parts department, and have your serial number handy. They will need your model and serial number.

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Ret. LE, FA Instr, S&W Armorer