I made a dual coil, higher resistance though, very tightly coiled. I attached a pic of an early attempt before I decided to go with longer res wires. Look at a cisco for example, much tighter coils in terms of spacing, I've had some difficulty with not enough juice flow(as soon as a wick gets brown I can taste it, the pic's of a lot of the wicks on here after use fill me with horror, I am not normally a fussy person, I've smoked the cheapest rough cut tobacco without noticing, but for some reason a burnt taste in an atty has just the right off taste to trigger a bad response. Dual coil is on hold until I get more wick. I'm looking at different options(I'd like some kiln dried XC-116 to try but don't know where to get it, and wonder a little about the safety, I've breathed diamond dust and done damage that way, so I'm cautious about ceramics too). I see so many options available in different places, as soon as I can get more flow I'll go back to it I think.
I ran into trouble on my last single coil one, coils too close together causing a short that was giving me a burnt taste. I always do it with a small piece of extra wick, as per the HD ecigz review video.
The best tool I found is a small dentist pick, it has just the right angle so that I can hold a coil I'm winding in my hands, and evenly space the coils with it. I'm not really understanding the alternative windings though, wick outside especially, does that mean wrapping around the coil or what?
also the 4 pronged one, where does the extra wick go?