Mine were full of crud so I cleaned them, attached them to a working platform and worked them until they rolled smooth. As I recall some of the balls had moved out of their correct place, and I had to knock them back. The lifting eye is just a handle for sliding them.
I don’t know if this is true of the OTS, but with the FHC we came to the conclusion that there were 3/8" plywood blocks to raise the runners up above the carpet.
My seats move very nicely now.