Ambull
OCD Muscle Saw Collector
I would think that a single ring would be better lubricated, because it gets lubricated in both directions. In two ring pistons, the top ring gets lubricated on the up stroke, and the bottom on the down stroke. I three ring pistons, the same thing, except the center ring never gets lubricated, except when it passes by the transfers. You guys can let me know if I am totally full of it, or if I do have a point, lol.