naptha doesn't extract the goods, if i'm understanding correctly....naptha will extract out the yucky stuff that tends to make some people sick or have cramps or whatever...once you use the naptha, you let it all evaporate off the seed mush and then put the seed mush in some grain alcohol (everclear, something that is more than 50% alcohol, or 100 proof...) and let it sit, maybe shaking, whatever...the stronger the alcohol, the better...the ethyl alcohol, ethanol, the stuff you can drink, is what extracts the lsa...you can also use isopropryl alcohol for this, but then you have to let it all evaporate off of the end product 'cause you can't drink it...probably would leave a good end product to lace pot with though...don't forget isopropryl alcohol first turns to water (when exposed to ventilation) and then the water will start to evaporate, which takes a lot longer...you may benefit from boiling the concoction for a while after the alcohol smell is COMPLETELY gone...the water will evaporate off, but leave some to evaporate naturally at room temp. because you'll cook the goodies if you boil it too much...

if your naptha container is pressurized, then you'll probably have to make a contraption to use for that part of the extraction...if it's a liquid solution that you can just pour out, then you can just put the ground up seeds in a small amount of it in an open container, stir around, let sit for 24 hours closed, strain off the extra naptha, and let the remaining naptha on the strained seed mush evaporate over time at room temp.... then put that mush in your alcohol...you can drink it if it's ethyl (drinking) alcohol, but evaporate it ALL off if it's isopropryl (rubbing) alcohol...