Just gravity, the album cover/box top was used as an inclined plane upon which to work. I prefer box tops cause they have a lip. Throw your shake in the box, tilt it so it falls towards one lip, use a card of some sort to raise the shake up the box, the weed is light enough it should stay where you leave it on the incline, but the seeds are way denser and should slide down. Sometimes have to tap the back of the box if the seeds are really in the shake. Rinse and repeat until you done. Also I never used this for buds, just for already ground up shake. For buds it would be add the step of crush them up first I guess?
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Don't sweat the technique.
And honestly. My fuck ups turn to gold so much the thought of fuckin up don't even bother me. So I keep it auto when I'm stepping through a portal. I know that sounds strange but, strange beats normal.