Doesn't all sealed bearings come out with the entire cartrage? I thought that was the advantage with them? Fancy hubs or less so, with a bit of work, grease and maybe new bearings they can improve vastly. I once had a 1954 hub rebuilt and greased, and the bike mechanics who did it was very impressed on how the old hub cleaned up. I don't think sealed bearings are lubricated, I think you just replace the whole thing?