suprtrkr how is the oval coils working. I just rewicked mine after two weeks. the color of the cotton was colored by the juice but not burnt, curiosity got the best of me.
They're actually more rectangular, and they are vaping like a beast. They hit the mod at .42-- it's on the Koopor Plus, and that one is usually about .25Ω high-- and I have had to turn the power down to 37.5 watts to keep from choking myself. Mine are a skosh smaller than yours as I wanted to make my tool so it would fit inside the air tower hole for best positioning. I tried that, and discovered it positioned the coil a bit too close to the barrel for my liking, so instead I put the coil a tiny bit closer to the posts-- maybe .5mm-- and tightened down the screws, then put the tool through the coil and into the tower, and levered it back outward. That worked like a champ.
The airflow seems a bit better than the old horizontal coil style. That increased air may be why I have to turn the power down a tad. I have thought about cranking the power back up into the 40-45 watt range and closing the AFC ring a bit, but it seems like heresy to choke off the fabulous air flow in an MT.
The one thing I have had trouble with is feeding the inner wick between the center post and the coil. I made it by flattening out the rayon after wetting it a bit, then clipping a point on it. I could stick the point between the post and the coil, beneath the upper coil leg. Then grab the point with the tweezers and pull it through. I am thinking a carpet needle will get the job done. I have one, a really big eye needle, for sewing up deep water fishing baits, to set internal hooks. (The IGFA permits 2 hooks per leader). Next time I wick I'll give that a try.
One other thing I'll mention, if anybody else wants to try, is the way the coil has to be arranged the legs have to come off the two narrow sides, not the long ones. I had some trouble getting the coil to stay that way coming off the mandrel. It wants to "uncoil" itself a bit, so it looks like a spiral staircase instead of a hollow rectangle. So I took and extra half bend on each of the legs, making them lay flush on the long sides instead of coming straight off the short ones. Then I pinched the coil between thumb and forefinger to hold it in place before pulling the tool out. Once I did, I grabbed the coil from between my fingers with the ceramic tweezers. Applying pressure on the tweezers, I could hold it in the right configuration long enough to torch it and get it to stay where I put it. Then I unbent the extra half wrap I put on the legs and they were pointed the right way.