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Alright everyone, calm down and fight nice.
You'd want to basically build a fill station, but have a standard ASA on both ends...instead of the one end having the valve to attach to a bulk CO2 tank.
Getting a normal fill station and changing the one end would probably be best. But that would be costly.
You could *Probably* get away with just using two ASA's from old guns connected with a length of stainless braided line. All of these parts turn up all the time from people upgrading their guns. This setup would...work...but it won't have any bleed valves or on/off valves.
Ideally the 20Oz would have an on/off valve installed on it. Not an on/off asa though, because turning that off would bleed the small tank.
The problem I can think of is having to weigh the small tank while it was being filled. Portable digital scale would work, just be sure you're not lifting or pushing down on the small tank, since the 20Oz would have to be above it.
Basically, stop playing before the 3.5 is empty. Then put it into a unattached ASA and empty it, so it gets cold enough to fill. Then put it on the scale and connect it and the 20Oz to your device. Hold the 20 Oz Valve-Down over top of the 3.5 and hit the on/off when it gets around 3Oz of liquid in it. Basically its just following the standard process of filling any CO2 tank. Just don't overfill it.
With all that out of the way, I haven't done this. I've filled from a bulk CO2 tank, with a normal fill station with on/off valves and purge valves. I've talked to someone to had filled from a 20 Oz, and he said he could get 2 sometiems 3 good fills from it.
At any rate, anything you use must be pressure rated.
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