Hey Shawn. I have tried the U wick method but never had any luck with it. For me the mesh feeders are the way to go. I finally found a gauge that works pretty good. I use a range from 60/40 to 40/60 pg/vg, normally 50/50. A high vg mix may require a larger gauge for the juice to pass through the feeder tube holes. This is just a standard size straight pin. Sorry, but my calipers are out in the shop. I set the length of the tubes to just touch the shoulders of the wick without any pressure on the wick.(i only use rayon).
Gauge the hole to small and you starve the wick, to large and you can flood it. Once dialed in the tubes last a while, with occasional manicure. You can see these are a little frayed. Hope this helps.
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