That's what I read !-- seems to me that -- a piece of say 4 inch metal pipe ( metal because of the low temps) reduced down to a quarter inch or so on each end -- the crumbled weed could be loaded into the 4" central pipe -- the whole device frozen -- supported over a collection vessel butane is sprayed into the top opening until it runs clear out the bottom !-- Would that work ?-- it's just a theory of mine !
I tell ya keef, it isn't all that complicated.
I do this in a glass jar.
I fill jar about half way with crumbled bud, put lid on & freeze.
Poke 2 small holes in the metal lid, spray butane in one hole while gas escapes from other. Fill jar just enough to cover weed.
Quickly stir it around & pour through filters into collection vessel.
Add more butane to the weed & stir again quickly & filter again.
All the good stuff is in the butane now & just needs to be evaporated, vacuumed & then used however you please.
Save weed to be used in butter or whatever.
Trust me, BHO has its share of garbage that comes along too.
Proper filtration is a must. after collecting your BHO, evaporate till it's thick but still runs. Now add everclear & dissolve it in the everclear completely. Now filter carefully, evap to half volume & filter again. Go back & run a little clean everclear through the used filters & refilter that then combine & filter again. Now evap under room temp. only. Vacume will remove last traces of solvent.
Now add PG or VG to your desired viscosity & homogenize.
Wah-Lah! e-juice.
My point is, I never used a special extraction device. You have to be very careful, but this method works just as well as any.
I had a little talk to that short green santa guy & he said he forgives you & will be stopping by this week.