I have an Air Venturi (that is supposed to be the same as Ninja) 90 cu in tank that I bought from Pyramyd a couple of years ago. It is regulated to 2900 psi. I want to do away with the reg so that I can fill a gun beyond 2900 psi if I want. Pyramyd says I need a new valve and fill hose assy, or another $160 or so. The threads on the bottle, according to Pyramyd, are 5/8 UNF or 5/8-18. If the bottle threads were the more common M18x1.5, there would be a lot of options, but at 5/8 UNF I can't see any cheap way to get this done. Any suggestions appreciated.