FWIW, I posted a bunch of pictures when I disassembled my final drive unit. My build thread is quite long. but you could drop in on it HERE and scroll through to see what is inside the nose of that final drive unit. If you don't care to read through all my brilliant prose, skip to the next relevant part of the story HERE. Below is a quote from Snowbum: click here and scroll down to section 5. I disagree with him about the Hylomar. I don't think it works well in this application. Here is what he said there on his page: Section 5. Leaky driveshaft drain plug: Usually this has happened due to the threads being stripped from over-tightening. If the threads are not repaired at exactly 90°, the plug does not go in straight. You CAN NOT repair the drain plug threads properly with the drive on the bike, NOR without disassembling some of the nose area of the drive, due to an internal threaded ring that has been discussed earlier in this article, that you probably won't see any of this from the fully assembled rear drive ...but you WILL damage things if you just try to re-tap the hole, or, worse, drill and install a Helicoil. The proper fix is to remove the rear drive and disassemble at the nose, and install a Helicoil. You need two special tools mentioned considerably above, heat, and a new seal (and on later models, a new plastic washer as noted earlier). I use HYLOMAR on the threads of the threaded ring. Hylomar works well on those threads. You do NOT need to do re-shimming.