Oh, yes, right: 1977 R100S with a gearbox from Waterworld. I replaced the input gear and shock-spring which were the worst pitted parts. And all of the bearings. I also switched out the plastic shift bearing for a ball bearing.
I will have to take that ride before committing to another, but it all seemed to go well. When I get a few minutes, I'm going to defend mold-a-gauge as the way to go for shimming.
R75/5 SWB, Aprilia Falco. Both compulsively modified. And an R100s is on the way.