My 1989 British Eagle tourer has some Ambrosios built on to Exage RM50 hubs
https://si.shimano.com/pdfs/ev/EV-HB-RM50-0981B.pdf
I haven’t cleaned, greased and restocked a hub since maybe the year this bike was built! So going in completely in the dark. I can find the ballbearings online, and...