OK guys here is a little trick I just picked up on using my VM. = If you take off the black regular cart that comes with a 510 Atty or a mega 510 Atty and from the fill end of the carto that is the open end, you come back to the first offset where there is the air vent in the cart, take an exact O or utility knife and cut it right at that point straight down cut so your left with only one small offset now, that cart fits right in the vapemate perfectly it almost snaps in place, the draw from this stock cart with the mouth end having the stock little round hole in it will give you a really nice draw and it sucks the fluid from your bottle with the tube in it right into the neck of the VM and it then Auto feeds your vapemate and it also is a pretty cool little end on your vapemate. If you don't want an open drip tip it stops any
juice from going into your mouth as well for those that don't like that happening,,,,, Give it a try, you may like it, I really do