I built up a 650B wheelset using a SON delux front hub and a used Deore XT 
hub that I got from ebay.  Turns out that the 90's era XT rear hub had a 
non-original freehub body on it.  When I put a cassette on it, the largest 
cog hit the spokes.  I did a bit of comparison with my other wheels with 
the same hub, and confirmed it was a non-original replacement.  I wanted 
this wheelset to be right so I ordered up a replacement freehub body from 
my LBS (through Quality).  Turns out that it seems that the geometry of 
these freehub bodies has changed somewhat, and hold the cassette closer to 
the hub body.  So the newer new one has the same issue.  I ruled out 
running a spacer anywhere on the system, for a few reasons.  

So, I found another 90's era XT hub, with the period-correct freehub body, 
that will get this wheel working.  I'd rather not unspoke the previous 
wheel and rebuild the wheel around this hub.  I'd rather just swap out to 
the correct freehub body.  That leaves me with a task that I don't recall 
if I've ever done before: removing a freehub body from a hub that is not 
built into a wheel.  

I've swapped out the Shimano freehub body on numerous wheels over the 
years.  It's easy.  Take out the axle like you are doing an overhaul, and 
unscrew the mounting bolt of the freehub with a 10mm allen wrench.  The rim 
gives you the torque to unscrew that.  I remember many times from my past 
life in the bike shop having folks come in with their rear hub and the 
freewheel still attached, asking me to remove it so they can try to build a 
wheel.  It was usually impossible to do it.  It was always at least a pain. 
 You can't get new spokes in, you can't get leverage on the driveside 
flange of the hubshell.  If the freewheel is worth a lot you destroy the 
hub to get the freewheel.  With a cassette hub you can spoke up a wheel, 
but I'd rather not build a temporary sacrificial wheel just to use as a 
tool to do this on a bare hub.  

My thought is to put a cassette on there, and use segments of chain (at 
least two) attached to a wooden frame to act as a retention tool to hold 
the hub steady while I reef on it with my 10mm allen wrench.  I'm pretty 
psyched about my concept.  I might even video it.  But I wanted to ask if 
any of you have pulled a freehub body off a bare shimano hub.

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