How do you rewick with cotton if cotton is flammable? Wouldn't you be inhaling cotton?
You cannot dry burn cotton. I use 30ga kanthal A-1, 8 wraps on a 16ga needle (5/64 drill bit). Get the wraps as close together as you can, touching, if possible. Remove the coil from the drill bit, compress it with tweezers, and torch it (or use a lighter) so it glows for 10 seconds. Let it cool. Put it back on the drill bit, insert it into the head and terminate the negative and positive leads.
Thread the coil with a wisp of rolled up cotton from an organic cotton ball. You should feel a slight resistance from the cotton in the coil as you pull it through. Snip the ends flush with the flange at the bottom of the head. Now, put a couple of drops of e-liquid on the coil and cotton to wet it. Roll up a small piece of cotton as a flavor wick, place it on top of the coil, wet it as well with e-juice. Replace the chimney over the coil, making sure it is seated well.
Fill your tank, screw in the head, and let it soak for a few minutes. Take a couple of hits without firing your device, then vape away! If you start getting bad taste or flooding, remove the head, expose the coil, remove the old cotton with tweezers. Dry burn the coil, rinse it, dry burn it again to dry it, then rewick it with more cotton.
Hope this helps...Good luck!