Umm...where’s the juice fill hole? What is this useless “juice slide cover” thing? If you do dual coils, put the cotton in like you would on a typical RDTA, there’s no where to add juice. The entire slot is filled with cotton, unless you carry a syringe with you but, who does that?? The silicon “boot” that comes with the atty to close off one side so you can do a single coil build has these little “feet” that extend under the posts which overhang the juice slots. Cut those off, push your cotton more forward and you barely have enough room to fill with a pointed tip like on a unicorn bottle. It’s easier to remove the silicon boot and fill that way but, that’s a P.I.T.A. I don’t see a way to do a dual build and be able to fill, not just easily but, at all. I have a single coil 22g, 10 wraps on a 3mm. Good flavor and plenty of flavor but, the design need A LOT of work to be easier for the user.