After your cotton is all set I like to raise the ring a full twist or 2 so where the cotton shows from under it that area is widened and higher, this makes it easier for juice to wick.
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Now take the Chamber/Barrel and hold it so a hole is over each coil and then push it on, this makes it so the holes are no where near the cotton as it goes down and it leaves the cotton undisturbed.
Someone on a thread told me they kept dryhitting and another person said they were getting leaking so here is some trouble shooting info based on what stemmed from them:
Im guessing your stuffing your cotton in tight into the juice ports, the others didnt have enough wick in them...the cotton needs to be light and fluffy where juice makes contact or it chokes it off instead, having it too loose you can use the juice control to close it to prevent leaking...
Cut your cotton flush to the ring and use a flathead to LIGHTLY guide it into the port, it should just be cupped by the ring and port. If its bunched up then pull it out and fluff it with your screwdriver and then try again.
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See how my cotton looks fluffy and not force into the ports? No cotton showing under the ring? Those tips end right after where the ring is and there is about a millimeter between the tips and the juice ledge. You can see the ledge where the cotton should rest on/above if you raise the ring a few twists.
If you have problems getting it right then remove the ring, get your cotton cut at the ledge and then replace the ring and the pull the tips up lightly, not enough to pull them out. The better cotton prep you do the better your wicking will be when vaping, pay attention to detail, after you get it its very easy to replicate.