I recently rebuilt mine. It was pretty straight forward. The absolute hardest thing was getting the compressor nut off. It was left hand thread. I'm not sure if all of them are so just be careful. I had to use heat to get it to break loose. I got my rebuild kit from John Craig/Limit Engineering. Decent price and had it in less that a week. There is a pretty good article on gnttype on a rebuild and you can find several articles on the web.