Today my left cylinder started bubbling hard. It went from showing 160b to 80b in about 5 minutes. I tried retightening, but nothing was helping. It was a great experience overall, my buddy had his long hose ready for me the entire time, and I learned how to feather the cylinder to prevent wasting too much gas. My right cylinder was completely fine of course, so never any real problem.
Turns out it was the internal post that had gotten loose. The o-ring was completely mashed (see picture). Swapped it out and we’re ready to go again.