I just purchased an old bike with these French hubs. If it was the typical Japanese equipped bike, I would know how to dissemble and rebuild the hubs with readily available replacement parts. Of course, the French have their own way of doing things, and my understanding is that bearings and cones are virtually nonexistent. I haven’t attempted to open them up yet, and frankly are a little intimidated to do so. Has anyone had any experience with these sealed bearing hubs?