If you want to completely disassemble the pistol, I suggest the AGI (American Gunsmithing Institute) video on S&W 1st, 2nd and 3rd Generation Pistols (available at Brownell's on DVD). My brother gave me his copy when I got into S&W 3rd generation pistols a year and a half ago (I've got 13 of them now). I found it to be an excellent "how to" video. Good luck.

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1st Signal Brigade, RVN '70