High Cello. There's no way to get even a steady level of (inadequate) strain with these
coiler designs. You might perhaps add some if you wind fast but the pin which forces the wire onto the bit prevents even compression. Though thick wire winds look stable in such static loops, they're not. Plus it's easy to just form something. You don't need a 20buck
tool for that. You need 1$ instrument screwdriver, your thumb and index finger and you can form wire onto a pin all day. Probably tighter than most of these
devices.
Some are going to argue well they want to stay that shape. Well yeah. They want to stay an incomplete coil that still has to be compressed and or touched to become a real microcoil and get the resistance and stability advantages that brings.
You need about double the thumb-index pressure or force to get the wire, depending on gauge, to the point of strain that it wants to stick as a unit. What I refer to as
adhesion. It's there that you're going to be able to pulse to the most uniform state of oxidation and
lock in the advantages of turn-to-turn contact. Forming the wire doesn't get it there.
Even from wind to wind on some of these devices you see turn deviation, end turn incongruity, high turns, low turns, differences in the pitch angle. It's a mess. And even small deviations unseen without some magnification can throw off your res and produce spontaneous hot-cool zones you don't necessarily notice
until you vape them. Then you ask yourself, why didn't I get that last time? Well they don't come out the same each time. So in many respects it's like the unpredictable factory hand wound coil. But in every case hotter and not nearly as uniform in heat distribution as a proper tensioned micro.
Quite honestly having studied this technology for quite some time I'm surprised by the indifference to the science involved by some, what we know about how things work. It's not only baffling but disconcerting as equally counterintuitive from a sales and marketing standpoint. You'd think those selling and producing these articles would want to improve your vape. Stands to reason you as a consumer are more apt to acquire more gear if you're better satisfied with your results, no? So this whole thing makes no sense to many of us veteran vapers and contributors.
I can guarantee you with all confidence that you will too, if you try this
see its distinct advantages (and disadvantages when they exist). You gain the skill to not only gauge what a proper electrical circuit may accomplish but every deviation we are likely to experiment with and to put it in perspective.
Then you get a lot of practiced hands, and I could easily be one of them, that learned on open winds and swear by them...because I can make 'em exact every time, I'd say. Nothin' wrong with that. If I were and never cared to try tension, I'd be on your side of the isle scratchin' my head. And I'd likely stay right there 'cause it's comfortable. And that's ok too.
What I urge all vapers and particularly new ones is that this is a valuable tool. Once you put it in your pocket, you're going to see its benefits and always want to use it.
Give it a go and see for yourself.
Good luck all.