Inside a machined trough in the rear bearing retainer lives a felt seal, like the mainseal in a BMW. If I had been slick I would have asked Jerry the machinist to mill one side out so I could use a Nitrile seal or something, but I forgot. This felt seal is new, all the way from Estonia. I primed it with 90 wgt and squished it in with my fingers. I had the bearing in the retainer and hammered onto the crank and some bolts started, and was feeling pretty proud of myself when I looked down and saw the bearing cover washer and the evil "wavy-washer", bane of all Russian motor-rebuilders, lying on the bench. F**K! So, had to get the puller out and try again. The "wavy-washer" is the theme of a few web-threads that I read. No one is 100% certain where it goes on each model bike, it seems to me. It doesn't show up on some of the parts explosions, even. It's meant to serve as a spacer to keep the bearing off the slinger, or as an end-play eliminator, just before the flywheel. That's where mine was when I took it apart, so that's where I put it when reassembling... You can just see it in there.... Next, a poor safety wire job. I have to get some of those cool pliers... Last bearing is the cam bearing. It has its own retainer plate the keeps it snug in the case.. Finally the timing gears get pounded back on. The lower one was a challenge. I finally ended up putting it in the oven and carrying it down cellar with welders gloves. It went right on, heated up. the bearing plate bolts will get a crummy safety wire job with the needlenoses, too. Starting to look like a motor again!