SWIM has never tried dmt fumarate sublingually. But one may be able to snort 150mg fumarate salt (= ~100mg freebase) for a ~1 hour experience which as a matter of fact did not impress SWIM that much. Plus it's a lot of material to put up the nose!
As for the tek, SWIM has t o repeat it, take good pictures and measure times accurately. But to begin with, this method started being developed as a means of what to do further with dmt-fumarate.
Chronologically, SWIM decided to use fumaricacid saturated acetone (FASA) to salt out freebase dmt from non-polar solvent. In its philosophy, it sounds a bit like Cosci's tek.
So, the basified plant material was extracted with xylene. One may pull with repeated volumes of fresh xylene if one has a lot or re-use the same tiny amount (100ml for SWIM) again and again and again. SWIM opted for the second option because hates working with big volumes of xylene; it smells nice, but it is also alarm signal for the neighbours and whoever would like to stop you from doing what you are doing.
Anyway,
a) first xylene pull (coloured piss yellow) goes in an appropriate container.
b) FASA was added dropwise, xylene became cloudy due to the salted alkaloids. One cannot put too much FASA.
c) solutions was left overnite at room temperature allowing for the alkaloid-fumarate to sediment. Now one got them out of the xylene without the need to evaporate it!
d) Xylene was siphoned off and washed with plenty of water. This was done because this xylene had traces of acetone and fumaric acid that one does not really want. Water washed away fumaric acid and acetone, leaving back clean xylene (plus the yellowy plant oils that dissolved into it). This xylene was used for the second pull etc etc. By this approach one knows when to stop pulling since at some point there will be no alkaloids in the xylene to be salted out. it took SWIM 7 100ml xylene pulls to exhaust 240g MHRB.
e) fumarate alkaloids were washed 3 times with some acetone to remove any residual xylene and oily impurities.
f) Then they were dried in the oven at 70 Celsius until pretty hard.
And this is the point where the centrifuge can be used; one can get the fumarate salt dissolve it in water, basify and pull with fresh xylene, then evaporate it to get pure freebased alkaloids. But SWIM couldn't really be arsed. So he dissolved the salts in the minimum amount of water, basified and then stuck the solution in the centrifuge to collect them.
The philosophy of the centrifuge is as such; Something is spun at very high speed usually at the range of 5000rmp (rounds per minute) to 20,000rpm, and this generates a force (centrifugal force) which effectively makes things "heavier". So, one can generate a centrifugal force of, say x 10,000g which roughly means that an object (in our case an insoluble freebased alkaloid) will behave as 10,000 times heavier. A centrifuge just speeds up something that anyway happens (i.e. precipitation).
And it is totally unnecessary; In a SWIM's pilot experiment fumarate alkaloids were dissolved in the minimum amount of water, basified and then let it sit at room temperature. This milky solution got clear after 2 days and SWIM could observe wee shiny crystals sitting on the bottom and the sides of the tube trying to protect themselves from the hostile aqueous environment...How cute!
