Nice piece of kit, but not easy to make.... especially when you consider it would require a different ID for every different make, to match the tube ID.... Don't forget you need a bleed valve on the OUTPUT side to empty it for disassembly prior to each adjustment change.... If your regulator is vented (most are).... you will also need a vent hole to equalize the pressure in the Belleville spring chamber to atmospheric.... just as you would in the reservoir tube in the gun....Bob