Glen, a really stupid question, where did you get the regulator for your Argon gas bottle (partially shown
here).
I wasted 20min today talking to an "expert" sales person at Bunnings about the regulator for their Argon gas bottle (same bottle as yours). He said that the bottle ONLY connects directly to a MIG welder and that regulator for it does not exist and there is no way in this universe to get the gas out of it (apart from the MIG welder of course). I even showed him the photo of your bottle with a partially visible regulator and he just kept saying it is something else... amazing ignorance. I am planing to go to a different Bunnings tomorrow.
Thank you