I'm just getting ready to put my brake hubs on my new diff and don't have any experience with green bearing axles. What retains the axle in the tube? After unbolting the retainer, it doesn't slide out. Also, do I need to fashion up a gasket to go between the hub and retainer ring or do they go on bare? The old 8 3/4" had gaskets on each side but the bearing wasn't sealed.

Dennis