THE BETTER THE WEED THE BETTER THE oil. I use 2'' pvc 2' long 2 end caps like that other guy, two holes 1 ineach,small like,11/32" fillw/shake, ...an oz or 2. you'll need a fixture to hold it above a PYREX GLASS bowl or cake pan.Use glass pyrex only!!!!! You should also rap the chamber to insulate it. This is cold oil extraction, I willl fill the chamber with 9, 11oz cans of lighter butane for camp stoves. Not fucking propain!!! It will drip out yellow liqued for like 20 min', that will boil from the heat from your hand. when the chamber stops leaking, take the liquid butaine in the pyrex and place it into a bath of water that you boiled, inside, and brought outside.the the oil will start to boil rapidly and form greenish ics crystles. whick you should scoop ouy using a fork or somthing. this will happen rapidly and most of the liqued will evaporate in like, 2 min' leaving you with a way gooey film on yer pyrex. you shuold let it air out for a few hours and then scrape the goo with a razor blade and a few butter knives. Wax paper or "sticker back " works wonders for something to put it on for storage. Melt a little in a spoon, and then put weed in the hot oil mix the two toghther and roll a fat doobie. invite 12 people and have fun!