I recently got one from Zeagle Express that came with the standard o-ring kit stapled to it, for 15 bucks. The new orifice is very nicely made and is probably worth the cost of the kit. With 3 (like breathing) ZX second stages installed on the same first stage, I installed the new kit in one of them but could not get it to breath even close to the other 2 before it started leaking air. I removed the new shuttle assembly and installed the old spring (shorter and stiffer, the new spring is longer and softer). When re-installing it I manage to chip the new seat on one of the lever feet, so I just tried the old seat (which was deeply cut by the old knife-edge orifice). To my pleasant surprise, the reg stopped leaking air and I was able to tune it comparably at first and then better than the other 2 second stages. I'm attributing the cessation of the air leak to the older, stiffer spring, and am surprised at the sealing ability of the new highly-polished orifice which seems to have an ovoid contact surface. I hope this is readable.
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