Well if you have a uniglide hub with the bulge on cluster side, not a silent clutch free hub. Then you can find a hyperglide hub and you can take the cassette body holders( or whatever they are called). You can swap this onto your uniglide hub. For about 30 bucks you can pick up a hyperglide hub. I know there is one on ebay right now. Also sheldon brown has a tutorial on how to do it.