loose bearing race - K/H disc hub

Al kinds of suggestions as to how to "fix" it. Since a good used one is available, make your life simple and just go that way. With a repair, who knows how well it will hold up, or what you would need to do with a future bearing replacement. Would you have to go through with another "fix" at that point? Not worth it IMO since you can just get another part. I'd also take a good look at your spindle. If the bearing got hot enough to spin the race (and maybe the cone), it may have damaged the spindle also.

The only issue here is what is a "good" used one. No matter what you're buying a used hub. Maybe you're buying one that's perfect, but more than likely you're buying one that has some kind of wear somewhere. And most of the time when you're buying a hub you probably don't have the opportunity to measure all the tolerances beforehand. So it would be pretty easy to just trade one problem for another, or get another hub that has a race issue.

Don't get me wrong, I'm not saying I wouldn't try to find a replacement. But they're not making any new ones, and until they do it's going to become more and more necessary to repair them with one method or another.

If you loctite a race in place, I pity the the next guy trying to replace it.

Like stated, you just heat it and the race will fall out. Granted, at that point the next guy will have to decide how to repair the hub again, but, that can happen regardless.

These things do have a life span, even hubs that are assembled without any issues will eventually need some repair work or replacement.
100% fact. I never set a sleeve like that without locktite. They make a special compound just for that. I keep it on the shelf for exactly that purpose.

No way would I set a sleeve like that dry.

One issue I see in this thread is we have people playing machinist when they are not.

Exactly.