Pam, Not having kept copies of what I sent you, I'm going to shoot in the dark here. I know part of it was from the Gun Digest Book of Exploded Firearms Drawings, 3rd edit. by Haroldl A. Murtz, p. 363. Also, I believe I sent you info from "Antique Firearms Assembly / Disassembly" by David R. Chicoine and perhaps from another book by same author, " Smith & Wesson Sixguns of the Old West" Different authors used different terminology for the same parts, which can confuse newcomers, so I hope all this helped. Ed.