Found a great vendor. Amber Waves Brewing Supplies 2808 LaVista Road, Decatur GA 30033, 404-315-1100 $35 for a custom rebuilt regulator, ask them for 0-10PSI spring and 2nd stage gauge. It will then be possible to reduce the pressure to a low enough value to use regular air hose and valves for the rest of the project, just like with an air pump. No need for a special needle valve. Dave Gomberg, Experimenta San Francisco CA USA gomberg at wcf_com