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I agree on the Nelson stuff. I have bought lots of components from them and found them excellent as well as good for their "oxy-miser" cannulae and etc. They sold out to Oregon Aero or something like that, but same stuff from same designer, etc. Their oxy-miser stuff includes a measurement device with the oxy-miser canula scale on one side and a regular mask scale on the other side so you can read off/set the flow accordingly.
As for the factory system, mine works fine (except for the question I asked that started this thread), and I like having the Nelson portable hanging on the pax seat because if you're at 25,000 and something goes wrong with the O2 system, you don't want to be making some headlong dive to get back to thicker air. Whenever I go that high (my '67 T337B is certificated to 33,000), I hook up a spare mask to the Nelson protable and have it ready so that I only have to twist the knob and slip on the mask.
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