[John Hoffman]

Bill - There was a post/replies within the last month on the CPA (Cessna Pilots Association) forum. It was a 210 that had leaking swivel joints - sounds like what you are dealing with and hopefully 210s and 337s have the same joints. Search "swivel".There is a series of replies with info re. repair of the joint by removing roll pins and replacing a teflon backing ring which seemed to be reuseable and an O-ring which is the leaker. Being computer challenged I dont know how to forward it to you but hopefully you have some connection someone who loggs in to CPA. The poster of that thread reported that he had "fixed" the problem without going into detail.