12. The outer bearing isn't installed in the hub until after the hub is on the spindle, but the inner bearing is held in place with the grease and the new hub seal. Installing the hub seal is done with a hub-seal install tool, but if you don't have one you can use a wide block of wood and a hammer. The tricky part with the hub seal, as with the races, is installing it squarely and evenly in the hub. Take your time with small taps until it is started, then crisscross over the edge of the seat to slowly tap it into place.