How you slot it doesnt matter. There is a horizontal coil with a wick hanging down some part of the way down the tube. I'm not sure how far down it goes as i havent taken one apart. The wick is amongst the filler material. So juice gets into the filler and is then sucked up by wick up to the coil. The coil isnt touching the filler at all. The wicking action pulls juice up to the top and keeps all the filler wet. It's like a constantly cycling motion. The excess juice on the wick gets soaked up by the filler, which feeds the wick.