make sure you massage your cotton properly so all the strands align one way, after securing on coil, cut the tail of your cotton right by where the edge of the atty ends, then using tiny (-) screwdriver jam your cotton by massaging from top bottom of the cotton tail to the hole, make sure it's a reasonably tight fit so you never get leakage ever. No need to have the tail of the cotton halfway down the tank as that will only drives you nuts with the difficulty executing it and oversaturate your cotton killing the flavor. When you start feeling the cotton is not having enough juice just invert everything for a few seconds and the wick will be perfectly loaded again, just perfect not too wet and not too dry. I personally use 24AWG Ni80 3mm 8 wraps spaced positioned in alignment with both wicking holes and as low as possible without shorting the center pin on the upper deck, half open on both air holes, insane flavor powerhouse!!