To your very first question; "where to" on parts.

"Jack First" in Rapid City S D.
They now have a web site that may or not show your S&W because it's just now a few months in the making, but, if there has ever been a more knowledgeable group of people to talk to about older gun parts I have yet to come across them.

I almost know they have most anything you need for that little Smith, and with a proper gun ID on your part,(( year, series, S/N )), just a word description of the wanted parts will be all you need.

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