The bearing race on the driveside is integral to the freehub body, right? So if the bearings seize the freehub body will no longer ratchet. That is my guess.
Believe it or not I have overhauled a shimano freehub body. I was able to find a drag link socket that fit perfectly with minimal grinding. Not rocket science. If you can overhaul a campy shifter you can do this.
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