Could you try your pictures from post #22 again please, as not all of them came through.
Doesn't matter really what way up the CO2 cylinder is, you are using so little gas that there is b*gger all chance of liquid CO2 making it into the regulator. If you really want to "waste a worry", all of you guys using fire extinguishers you should really be using them upside down, so you only let gas out. There is a dip tube in fire extinguishers that lets out liquid CO2 when used to put out fires.I believe the cylinder itself can be ruined if you don't have it vertical