Swagelok parts have a proprietary threading. You can't use "over the counter" parts from places like HD, Lws or like places. The intermediate parts have to be genuine parts and connectors. If you get the right materials you will have a metering valve to rival many others. Swagelok is like Benz, you can only use Benz parts on a Benz, unlike Honda/Acura, they are cross compatible (brass, stainless) so on...it's worth the money spent in the end. Good luck!
-Amat Victoria Curam...Victory Loves Preparation
Good judgment comes from experience, experience comes from bad judgment.