could someone please explain to me what punching a carto means? i'm guessing your poking a hole in it somewhere but where and why? what's the purpose of this?
I'll put in my variation of where I punch my holes and how I do it with a saddle valve.
1) If you're using cartos with no holes and want to put it in a tank, this has to be done.
2) First, I screw my carto onto my pv (which is a silver bullet) and put a mark on the carto that lines up with my button. This is purely for my personal preference because I like to press the button with my thumb and hold my SB on an angle. This places the hole at the very bottom of where my liquid will be if I don't have my tank topped up with juice.
3) I unscrew the carto and place it in the saddle valve and line up the punch part with where I want my hole. The best place, in terms of height, is about 2 millimetres above the bottom of the inside of your tank.
4) Punch it. My preference is to wait until I hear the pop and then do half more of a turn. Note that I do vape with 100% vg and need that bottom hole bigger as NebulaBrot mentioned already.
5) Place in tank, fill and vape happily
Look for pbusardo's tutorial on slotting cartos. He talks about punching, but his preference is to use a dremel and slot his cartos. He also describes where to place the holes and shows it to you in his video.
5) I then punch a second hole near the top of my carto to get more airflow in it. I just punch it until I hear the pop and don't make it any bigger.