Also, there are two flavors of Uniglide. The original, a press-on mount of the freehub to the hub body, are not replaceable. The 2nd gen model bolted onto the hub body. These can be readily replaced with Hyperglide freehubs. I've seen both, with the 2nd Gen freehubs on a 1988 Trek and 1989 Fuji, if these dates help.