Alright I'm building a bike up at my local co-op. I found a nice rear wheel there, however it has a unique hub. One of the volunteers there was telling me about it. It was as he called "the transition between a freewheel and a cassette". It was called something along the lines of a "Michod" hub. The whole thing is like a screw and there there's a lock ring that holds everything in place.
However the hub is missing the lock ring and the the co-op doesn't have a specific tool needed aswell. He said I could use it if I could find those part, most likely on ebay. But in my absent mindedness I forgot the exact name of the hub. Can anyone shed some light on this?