Hey guys, So I need some ideas on how to best make some rotary seals (or a good alternative) for a school project I'm working on (which has a very tight budget). I'm creating some small PVC pressure vessels to put some medium sized RC servos in, and I need to run the servo's drive shaft (or an extension of it) outside one of the bulkheads of the housings, which then attach to a thicker rod above it. My plan so far was to create the PVC housings, and then go from there on designing the seals... So I was hoping to get some ideas on some different types of seals for this shaft. I guess I can always use some design out of parker o-ring's handbook, but I wanted to ask around before I do that. Any ideas? Restrictions: - System is going to be operating at 20-30ft in fresh water (and possibly a few pools), and I was hoping for a safety factor of around 3, so I'd like it to be good for 80-90 ft. - I have access to a machine shop with 2-axis CNC mills, and also some decent lathes...I know the mills are good to around .002" ish, but I'm not sure on the lathes...so i'm really hoping that there is good alternative that doesn't require a lot of precise machining (although not out of the question). - Cheap Any suggestions on a good/cheap alternative to the PVC pressure housings would also be welcome. Lemme know if I need to clarify something, Thanks!