How do you refill the bottle ? Thats the trick, I think .
This is the go for us, Particularly if you are higher consuming through mig application.
Keeping in mind we only do this with Inert bottle products, that are not capable of feeding a fire.
Get a few meters of hydraulic automobile malleable brake line pipe(it can cope with the pressure requirements). Then fit the ends with “bottle to bottle” bridging fittings
If you don’t have a friend who has a tax deductible bottle account, make one. Eg; panel beater.
I have two bottles, One working. The other filled or waiting to be filled.
When you have an empty bottle, It is time to touch base, with old mate. When his next full bottle arrives. Hook yours to his and steadily equalise transfer. Then slip old mate appropriate remuneration for halvies. Friends are a handy asset.
Although I have just set up an ABN, and will soon consider returning to a tax deductible filling account of my own.