I've read a few times about punching holes in cartomizers, for use with tanks or something?
I tried searching but it only ended in confusion (as usual lol)
why put holes in a carto then?
The cartomizers with holes are for tanks. The cartomizer sits inside the tank and juice feeds in through the holes. You don't have to stop and refill the cartomizer because it is being fed through the holes by the tank. It means you can keep vaping without having to stop and top up the cartomizer as often.
Some people use a device called a carto tank. Instead of just the carto (with the fiber inside) being full of juice, the tank is also full of juice and the carto fits inside. The holes are so that the juice in the tank keeps getting pulled into the carto. People who vape a lot like it, because they don't have to stop and refill their carto - it just keeps sucking from the tank it's immersed in, through the little holes.
The best taste I ever get is from atomizers - rebuildable or standard. Can't be beat.
I give a pretty good description on both cartos and cartotanks in this blog article on common juice delivery devices. Reading over that may help you understand.
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Cartotank Setup: http://www.e-cigarette-forum.com/for...ank-setup.html