JamesBon92007
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I would be very surprised if the dry bleed design works, once the piston is contaminated it needs to be replaced with a new one. Never have seen one work correctly after being contaminated , no amount of cleaning ever worked. Dry bleed system works to keep interior of 1st stage dry and clean. Obviously was contaminated and stopped working. Piston gets contaminated by water in tank or during improper rinse with dust cap off after a dive.
I figured that there must have been an unplugged port and the salt water got in through the top piston hole and made it's way down to the bottom of the cylinder. Contrary to popular belief I have managed to get a couple of Sherwood pistons to work again--there was a technical service bulletin issued many years ago that suggested a way to clean it. One of my pistons fell just short of the specs of how much air bleeding and another made it the acceptable amount. I figured I had nothing to lose.