Just to clarify, with the mini v3, screwing and unscrewing the deck is the flow control. Before filling, you tighten it down. This closes the flow control. If you don't do this, juice will come seeping out of the air holes as you're filling it. Then you remove the top cap and pour juice down the outer walls, not down the center tube. Just fill to the top of the glass and leave some air space. Once it's full, screw the top cap back on. Then unscrew the deck 2 - 3 turns. This opens the flow control and you're ready to vape.