Hand tight is in fact, not safe. Not with screw in systems at least. The original Max-flo is a different mounting system. If your threads bind into your asa or you cross thread it, even with air in the cylinder the reg can still unscrew.
Also the way your reg sits right now is not correct. You do not want any gap between your cylinder and regulator. That gives room for the o-ring that is supposed to seal between the reg and tank cylinder to blow out.
You need to crank that down more. If you are having trouble take it to your field/shop and have them tighten it down.
As it sits I would not even attempt to fill it.
Last edited by Tabris17 : 12-01-2012 at 01:28 PM.