Ultegra 6600 - change freehub body?
I ended up with a 6600 Ultegra wheelset (no cassette) in good shape. I would like to use these wheels on an older Trek road bike, but this freehub body only accepts 10 speed cassettes. Is it possible to swap out the freehub body for one that will accept a 7-speed cassette (with spacer, of course)? I'd like to use these wheels, but I'm not about to upgrade the whole group on the bike.
Thoughts?