Actually, that was the first place I tried. They told me they did list the gun, but didn't have the cylinder stop. Your post brought them to mind again and I called back asking for a "pawl", same answer. So I said "how about a cylinder hand?". She said "that we have." I had forgotten that this is one part with three names (or more?) depending on the maker.
So My hand/stop/pawl is on it's way.
Thank you very much. Also thanks to the people who run the "Firing Line"
for a great forum.