The rubber o-ring that goes over the tube looks like their should be two of them one under and one over that steel ring. Is this right or wrong. I don't have any drawing that shows me. I figured this is the best place to find out. B12
The metal ring is concave on both sides in the later editions which might give you the impression that there should be a o-ring on both sides. Earlier metal rings only had the depression to accomodate seating an o-ring on one side....but people would put the ring on backwards or forget which way it went. Probably saved a lot of customer service calls to make the metal ring symetrical.