I have my tanks dremeled out. There is no way for them not to wick. I vape 100%VG, so it makes it a bit easier for the thick juice to wick.
Ok I have had a 5ml. tank for about 3-4 days.first let me say it is excellent!!!..Loving it John...And John did a couple cartos punching them differently for me since I vape at about 6v.In one he punched one at the top and one at the bottom.It works good.But one thing John,the hole should be a bit lower I think as the liquid gets down past the top hole pretty quickly,especially vaping at 6v.That being said,even though the liquid would go past the hole,I still had no problems vaping it,But I did not let it get more than halfway between both holes.
John also punched a carto with 2 holes at the bottom.And while I am not sure exactly why,it does not seem to wick as well,and really didnt work much at all.
Which brings me to the one hole at the bottom carto.it is vaping very good also,maybe not quite as good as the one with the hole at the top,but I have only started breaking it in today,hence,this review is sort of early.I will know more by the end of the day.I tried punching my own holes in another cartoizer I have here,and I guess I dont have the knack..even used a book..lol..
then again,maybe it is the cart filler in my cart...All I know is I will be ordering more cartos from john.I will finish vaping the one with 2 holes one top,one bottom today,and really get it low and see how it acts.If it does ok,then I probably wouldnt change a thing on the double hole-punch John.
Will get back with more later..All in all great service and an excellent supplier to deal with.