This video shows changing the two hub shell bearings the axle rides on for the rear hub. This process will be similar for all Industry 9 bearings. For complete bearing kits, go to Industry 9's website and order kit HKMB21 - this covers all the bearings front and rear for Hydra center lock. I used a Wheels Manufacturing bearing press; #6309 is the right size for this job. But you can improvise with correctly sized sockets, washers, whatever you have, and you can use a vice. These are not tightly pressed.