I made and sold these diffs when I was racing a Revo years ago. I sold about 300 of these and stopped when Traxxas came out with theirs. I figured most people would buy the cheap traxxas instead of mine. They were based on a TTR S3 buggy diff which is one of the smoothest out there. I no longer make these and really don't want to start. I have no problem with other people making them though. If you want the drawing PM me. I've sent the drawing to a couple of people they can post it here if they want. I still have some misc parts laying around if any one is interested.