I had a hunch it might not be such an easy swap. The STX-RC MC32 recommended by [MENTION=251447]ThermionicScott[/MENTION] looks like it would go right onto my hub but as you point out, the stack height is probably different given it's a 7 speed freehub.
The good news is I took my 6 speed uniglide freehub apart today and rebuilt it. 50 ball bearings later and some creative spacer rigging, I've got it spinning like new. Not a bad job at all and it makes me wonder how many freehubs have been thrown out when all they needed was cleaning or a new spacer.
I may try one of these new ones anyway. They're cheap enough and if it does transfer over, would let me upgrade to 7 speeds.
Originally Posted by
dddd
You almost always need more than just the freehub body to make this HG conversion!
All of the axle components on the driveside end of the axle, plus the sealing ring that fits/presses inside of the threaded snout on the HG body, are needed as a complete set to assure assembled "stack height" correctness and proper sealing.
Get all of the parts together, from another hub, and keep them together! Do not attempt to remove the sealing flanged ring inside of the freehub body/bodies, as they are difficult to set in straight and easy to damage!
But note that there are several different standards for the mating of a Shimano freehub body to the hubshell. These all seem to have identical splines, but the stacked height (thus distance from spokes) can be very different, which (just as before, with the axle) can also cause insurmountable sealing and operating-clearance issues!
You have been warned!