Here is the link to some shots of the single stage cutaway regulator I acquired from E-bay recently. Makes it super easy to see how it works! This one is a Stream Air but other than the nozzle the Overpressure and Mistral are exactly the same. I left the pictures in large format so you can zoom in on a particular section if you need to see it up close.
CLICK HERE FOR ALBUM

Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB