No special tools are required. A hammer and a large screwdriver are used to remove a retaining ring either on the inside or outside of each cup of the cross bearing. Once removed, use a smaller diameter socket in a vise to press the cup out of the yoke. Repeat for the other 3 cups and if the yokes are not damaged, take the short yoke and a cup to the farm store for a match. If your vise jaws will open far enough, you can press the 2 cups in at the same time tight against the cross bearing. Reinstall the retaining rings and your done. Hardest part is not loosing the needle bearings out of the cups, the factory installed grease should hold them in place.