Jerry Kuhnhausen's book, "The S&W Revolvers, A Shop Manual" will help you with nomenclature, how to identify, communicate, and troubleshoot problems, and has a lot of info about design, function, repair and maintenance issues. Also includes detailed specs and many fine illustrations.

Stoning your SA bevel on the trigger will not necessarily make the trigger pull lighter, (may have the opposite affect) and is generally not required unless you are repairing a push off condition, or have wear on the bevel point. If you haven't changed the OEM rebound slide spring, an aftermarket (Wolff) 14, or 15 pound spring will bring the SA down a bit. S&W's "factory standard" SA minimum pull weight is 3.0 pounds.

__________________
Ret. LE, FA Instr, S&W Armorer