Today I was messing around with an x-valve I have and while doing so it developed a leak down the barrel. It went away when I held the trigger so I knew it was in the powertube and most likely meant that I need to go down one carrier size. The only problem was that when I took it apart it already had the smallest carrier installed. I though maybe the carrier o-ring was just worn out so I replaced that but no dice. Then on a whim I though I would try a different carrier (same size) but that didn't help either. I should mention that there are zero shims installed as well.

These are usually an easy fix but this one really has me scratching my head.......

Any ideas?