I came across a Miche Track Hub with sealed bearings. One side spins perfectly, the other is comlpetely stuck. I pulled off the dust cover and it appars to be rusted shut.
It has ball bearings and a carrier that I had never seen before. It's not the usual kind that surrounds the bearings, but just is a single ring of metal with divots for the bearings that keeps them a certain distance apart.
The whole thing appears to be rusted stuck. Obviously this isn't going to ever be as good as new, but is there any way to make it at least ride able?