Sorry I didn't see you responded man. Search a video called "absolute shatter" on youtube. This guy gives PERFECT directions on making oil and shatter. He is very knowledgeable. I used his method almost exactly, except I used an aluminum spray bottle (wal mart) with a hole drilled in the bottom and my filters on the sprayer side held on with a hair tie. Aluminum is safe for this method. I also dried mine by sitting my pyrex with the blown product into a larger pyrex with warm water. Helps rid it of the butane faster. I would also recommend stirring several times and once you think it's been purged of butane, let it sit out another day. I didn't do this the first time and my gf got a headache. Enjoy!!! And watch your tolerance go through the roof lol. Hard to get high off just primo bud these days!
You need a vacuum-pump and a little chamber to get all the butane out mate, nothing else does it. Either that or leave the bowl open for 7 days (yup a WEEK). The latter method yields a CRYSTALLINE extraction

The oil is in NO way pure, it has solvent, the more solvent the more runny, you ever seen THC RUN? Didn't think so. Oil is sound for external medicinal use and super potent as a regenerative substance, small bits dissolved in alcohol make phenomenal differences.
But yeah far as the hash goes, there is a reason and a very good one everybody is recommending bubble... Screen rubs need a fuktonne of weed, take forever, and if you rub just too hard you powder vegetable matter in, good rubbing takes a LOT of practice, I can't come close to the quality my mates get yet. But bubble is bulletproof, you can't fuck up, it is always EXCELLENT.
Surge