Where do u get the equipment u need for that? Looked into it and there were a whole list
I was only doing a small amount but here's what I used/needed.
1) metal flask/vacuum/thermos
2) 3x tins of London butane (high purity)
3) A piece of wood that fits over the flask mouth with 2x 2/3mm holes drilled in it.
4) A bunch of trim!
Put the trim into the flask place the piece of wood over the mouth and use one of the holes to spray in the butane, drill it to a size so it acts like a clipper lighter, the 2nd hole lets out the pressure without spraying condensed gas everywhere.
Once it's in the flask there's no pressure issues you shake it do whatever you won't get pressure.
BUT REMEMBER IT,S HIGHLY FLAMMABLE AND EXPLOSIVE!!!
after 10/15 ime pour it through a coffee filter and let the gas evaporate, heat/cool a couple of times to purge any water/gas and you are left with a dark oil.
Best of luck.
I'm sure you are aware but I need to say it...
Remember its dangerous you don't want to have your head up your arse doing it, Remember butane is denser than air so it can easily fill voids in floor, Remember a light switch or fridge thermostat can/will cause a spark!
Just be careful.