How to press on right rear axle bearing w Hydraulic press

To repeat the one side which is non adjustable is one shall we say pressure point. The axle you have here with the adjuster is the opposite side. In the same way that a front wheel spindle nut applies pressure on both front wheel bearings to set the play for the front inner and outer bearings, this adjuster on the axle adjusts the pressure/ end play on both axle bearings on both sides of the car. So when you tighten/ adjust this adjuster, that applies pressure on the cup, the race, and transfers that pressure to the axle, which moves/ presses in on the button in the center of the third member. This button presses on the end of the opposite axle, and transfers that pressure/ movement to that axle, which tightens up the bearing on the other side of the car.