To install a protector, line it up with the hub, lay a block of wood over the front of the protector and strike the wood with a hammer. The protector is designed to fit tightly into the hub; therefore, it must be carefully aligned with the hub before hammering.
The bearing protector is held in the hub by an interference fit. To remove one, lay a block of wood against the side of it and strike the wood with a hammer. Place the wood on the opposite side and hit it again. Continue this procedure until you "walk" the protector out of the hub. Don't disassemble the protector to attempt to remove it.