I'm gonna go with the twist cap method like ody, still in build stages. Anybody can share the size of the slot for the wick on the ceramic? Here she is far from being finished lol.
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I don't have anything for precise measurement but I am guessing you are going to want to cut the grooves to be slightly tight on your wick. If it is to loose juice will flood the channels. If it is to tight it will choke the wick. So if you are using 2mm wick I would guess you want the channels slightly smaller then 2mm (smaller because you can always make them bigger if it chokes the wick but making them smaller isn't so easy)