Yes I followed what you say, however the bottom roll has the large gear keyed to it, so it might come out of the mill frame it might not.
It will still need this large gear removing and putting back on the new roll. My humble experience as an engineer of a few yrs standing, old neglected machine parts especially if water damaged will be seized on pretty firmly, and its unlikely that Gina will have the resources to do this exchange. As an aside, most of my machines are old or VERY old! and have always needed to be rebuilt. The drop stamps in particular. Heres a pic of the medium one .
All I had to start with was the 4 rusty castings salvaged from a defunct jewelley business in B’ham UK.
I had to make my own hammers. This one is 275lbs.