from my experiences of attempting to retain everything to do wtih weed...this is my method.....

first you need atleast an ounce of good crystaline bud.....then you take a sifter thing (basicly a box with a fine screen attatched....to it.....but the buds (slightly broken up but not into "shake") and start shaking the hell out of it over a peice of big paper....preferabely something white-ish so you can see the stuff when it falls out.....do that until you can't see anymore stuff falling.....then you "sweep it up" with a peice of card board and put it in a cellophane (plastic from a cigarette pack) and pack it in there as tight as you can (1 ounce of weed will roughly make enough hash to fill one of those listerine pocket packs...depending on the bud itself) and take a peice of newspaper and 4 inches wide and 8 inches long....placing it long ways away from you you then wrap it as tightly as possible wrapping it around and around until there is no more left to wrap....then wrap both ends over and tape it together with masking tape....put it in the oven on 375 for about 10 to 15 minutes and then cut it all open carefully and you have your finished product....now i could be wrong about all this but i do believe quite strongly i am right....this came froma video i downloaded off of winmx...feel free to correct anything or improve on idea's because when i have the weed to do it with i plan on doing it so any extra knowledge would be good!