For different reasons the rotisserie build was stretched out for a while,
and I did some other work in the meantime.
A long time ago when I disassembled the propshaft I discarded the old cork seal as I assumed getting a new one was a non-issue, but I was very wrong. Not one vendor seems to have it. I took some measurements and made new seals from a block of cork with the help of a band saw and a laser cutter, it should work.