Hi People! How do you "plug" the main ballast tank to adjust buyoncy (man, that word is killing me...) I'm trying to figure a way to use a 5/3 pneumatic valve. It would be easy to use to adjust bouyancy. But, I can't have the plumbing right at the moment. Any advise? Somebody know how it's done in a K-350? Thanks! Pierre Poulin "At last the sun is here!"