Not a bad deal to change, just work. But you do want to have the third member mounted in the housing (and it stays in the housing while changing the seal). It's a bear to break the pinion nut loose. I made a wrench that slipped over the pinion yoke with the free end sticking under the leaf spring to keep things from spinning while I used a 3' or so long cheater on a 1" ratchet. Also had to thin the walls of the socket I used on the bench grinder so it'd fit onto the pinion nut, you'll see what I mean. I used white marking paint on the castle nut and flange to ensure that on re-installation, I tightened it to the exact same spot.
