I redid a Cilo for a relative/friend. All I did to the rear was clean it up and re-lube.
I always take these projects to a bike shop, and as this one was making some noise, I took it in. They swapped out the chain and it quieted down, but skipped on the 15t cog.
The owner called, so I pulled a 6-sp freewheel off one of my wheels, and sent it in, only to learn that it was a freehub/cassette (which I never thought about, actually).
Of course, that wasn't correct, so the shop got a regular 15t HG cog and filed the notches, etc so it would work, and it does. I set about finding another 6-sp cassette for him.
I see by several ads that the UG cassette for DA is different than the UG cassette for non-DA? This, of course, complicates the search, and drives the price up. I'm starting to think we should just be replacing the worn cogs one at a time, filing if necessary, rather than pay $100 for some 13-18 near-corncob that he can't ride, anyway.
I'm not up on this older stuff. Can somebody clue me in?