Detailed info on the new and old yoke retention system and fitting procedure is given in the shop manual written by Jerry Kuhnhausen. "S&W Revolvers, A Shop Manual".....p. 47-49. The book, including the new 5th edition, is available from Brownells, Midway, and Amazon, as well as other sources. (local library)
Both peening and shimming repair strategies are discussed in the book.
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Ret. LE, FA Instr, S&W Armorer
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