I've had the drive shaft out of M8 sleds a number of times but never taken them out of a Proclimb. Looks to me like you can take circlip off brake side(leaving brake disk in place) and remove oil reservoir with the outer cover for chaincase, then remove chain, sprocket, and bearing on drive and then slide shaft to the side and down and out of the tunnel? Any helpful tips for making it easier would be appreciated.