What model cart are you using?? The 901 or 510? The 510 should have a ledge/lips down inside about a 1/4" down from the top. The 901 has a D shape and no lips as the air path is on the opposite side of the D.
Both the round and flat tip 510 i have the inner lips.
I have a new plug coming out tonight if i get the time.. wife wants to chirstmas shop.
I'd ask what kind of juice your using if its either PG or VG based.. but that dont matter with the new mod.. neither does 3.7v or 5/6 volts
Here.. cut a different plug out of the Blue Foam rite size U. I mention that as you need to make sure you have the right style as it matters as i've noticed the other styles are different material thats more like fluval.
Cut a piece thats a 1/2 long and 3/8ths wide. Now with the piece in front of you laying long ways across from left to right. Cut a ^ shape out of the middle thats about 1/4" from the top. Now it should look like a bridge with legs on each side. ( I actually used a paper hole punch to cut the ^ shape from the middle hehe)
Now to insert it is different from my other mods. Stand the bridge up on its legs. Pick it up with your thumb and index finger squeezing it together ( the legs together) Now insert it into the top of the cart so that the legs are touching the round sides with no lips. Push it down into the cart a little so that its resting on the lips. I doubt this will work on carts with no lips like the 901/801.. straw mod would probably be out.
Oh and fill the cart before ofcourse! hehe. Add a drop or 2 afterwards on the plug if it looks dry.
That should do it.
Make sure to hold your e-cig on an angle (45 degree) while your using it or just inbetween hits. Why? Well thats how the juice will flow down the cart on the smooth sides where the inner lips are not.. would be the same on any other cart as the juice will flow down the walls.. if you just have it standing straight up the juice will hold down in the cart. When its resting on the walls the juice will flow down the fall slowly as it has a path to follow.
If you ever get a dry fire and you know you got more in the tank thats probably whats going on. Hold the cig on an angle and it will flow down to the tip.
My new mod will grab that juice when it reaches the bridge legs and direct it to the center of the plug where its needed insted of just leaking right on threw.