I didn't see a most important instruction before replacing the grips: SUPPORT THE SIDEPLATE ASSEMBLY WITH THE THUMB OF YOUR SUPPORT HAND WHILE INSTALLING THE GRIPS!
Failure to keep the sideplate assembly properly placed while working the edge of the grip past the sideplate assembly can result in spreading the fingers that retain the hammer pin. Do this a couple of times and you'll be buying a new sideplate assembly.
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