i put a cap of dropper in the hole...i try to explain, you take one dropper, the one for tincture thing, the rubber top and cut it, use to seal the hole and put inside a plastic tube so from the hole you have a mouth inhaler...oh, my english...if i can....i put a photo of mine machine...sorry i can t explain well and i am a very new not experience in spice but i like to use my hand....if i find a way to put photo tomorrow i do it, it s a cool thing, spice experien e apart.