Congrats on the Service Six , you will never miss the Taurus now. +1 on the Ruger target grips too. I had a Security Six some time ago and I did the same thing with the grips. Targets are much better for my hands. What kind of 1911 did your Dad end up with?
Sig P225, Sig P229,P228
Sig P239, Sig P226, Colt Comm. 1911
Colt Python, G19 Gen 2
Colt OMM, GP100, Colt DS