Welcome to the forum.
S&W enthusiasts have long and commonly referred to pre June 12, 1957 models, when model #s were assigned replacing model names, only as pre model #s, i.e., .38 M&P Models with the same engineering developments as the Model 10, are pre Model 10s.
Reference to any.38 M&P as a Model 10, that's a pre stamped Mod 10 (or any unstamped model) is a common erroneous use of Model #s.
“A Pre-model is any "named model" that incorporates all design changes that immediately precede when the company adopted the model number stamping system.”
Videos you requested:
SMITH & WESSON MODEL 10 SERVICE REVOLVER PART 1 - YouTube
Note: The part referred to in the video as the crane is actually the yoke in S&W terms. Crane is the Colt name for that part.
SMITH & WESSON MODEL 10 PART 2 - YouTube