John, you talk about hoarding stuff. I drew up my first recumbent electric assist trike back in 1984, and bought a Tecumseh riding lawnmower rear differential to use as my drive to the back end. I had that thing "waiting" in the garage for over 20 years before I put it together. It looks just like the Comet go cart differentials that I saw prevalent in the '90's. Works great! I used a 3/4" diameter shaft for that project, and I also bought a 1" diameter axle for some other "project X".
It's funny how on the site it says that the differentials (with the cassette or freewheel mount) that also have a disc brake compatible mount on the housing, says that you're not supposed to use the disc brake on the housing for braking. HUH? Why did they put it on there? It mentions that braking should be done at each rear wheel. Did I miss something? My Tecumseh differential works fine with the disc rotor I had made special to fit the bolt pattern holding the housing together. The rotor brakes the entire housing which stops both output axles from rotating. I don't see why that would not be the same case for the Samagaga differentials. Go figure.
And now I've got some parts that I've only had a year or so (so not really deeply archived) that I'm trying to sell,,, and not much interest in them. Maybe I need to wait 20 years before somebody says, "hey, that would work". It's all good!
Tomas