I think I know what he's talking about here...

On my 87 300E the RR bearing was obviously bad. Got the bearing, pulled the carrier w/ hub flange and took it to a shop to have the old removed and the new pressed in.

Where the inner races (2 pieces here) ride on the hub flange we found that the inner (towards car center) 1/2 of the inner race had spun on the hub flange and wore it down some. Not good.

Now I'm waiting for the new hub flange to get here so I can get it back together.

A few months ago I had to do the LR (second time) and the hub flange was good. The car has 267, 000 mi., so I can't really complain.