guys, it'd be my guess that you need to go to the:
smithandwessonforum.com
and ask over there on the appropriate board. I'd say on the pinned & recessed board. On all things S&W, go there and ask. Roy Jinks, Lee Jarrett & all the best experts in the world on S&W hang out there every day and are eager to help those who like/collect/restore S&W firearms.
there's a knockoff imitation S&W board too, so watch out & just use the one Lee Jarrett & the boys have, his handle is: handejector. Hope this helps.
be safe, enjoy life, journey well
da gimp
OFC, Mo. Chapter