You seem to have a deep interest in the topic. I suggest you talk or correspond with the Davids Chicoine (Sr & Jr), who restore old S&W's. They are very good.

Here's the website: oldwestgunsmith.com

My underatnding is that for S&Ws they are about the best out there, rather like Turnbull for Colts. I've been well pleased with work they've done for me.