CBB
I started using drip tips on cartomizers to make it more convenient to pull it off to refill. But after a while I realized that if I used a 3/8 drill sharpened to a 90° included angle and drilled up from the bottom of the delrin drip tip until it tapered out the bottom nearly to the edge then used a sharpened dowel in a drill to polish the taper it would proivde a ramp surface. Now I can hold the carto at a steep angle, about 15° from vertical, and drip into it and the
juice clings to the side of the tip and runs down the side of the carto. You have to be careful because you can't see the batting getting wet but if you know how much it takes normally to top off when you decide it is needed you don't have to remove the tip.