If you want to fill your clear dc's easy, I have found a method that works great for me. I take a cartridge that is used for atomisers ( every Riva kit I have came with 10 and I can't through anything away). I cut about 1/4 " off the atty end and remove the mouthpiece and inner piece (with the small hole in it) with a paper clip. Then I insert this modded cart into the open end of the carto until it stops. I then drip 10 drops at a time into the end , blowing VERY gently into the mouthpiece to clear the chamber and force the eliquid into the batting. I can get 50 drops in there in about 30 sec. If it gurgles, you put too much in at a time or its full. If that happens, I flip it over and VERY gently blow into the batt end until no gurgling. I stress the gently because I have found if you blow too hard, the liq tends to siphon into the center tube. I have used this on 510 cartos, and g4's, but i didn't know how good it worked until I got the clear dc's. WOW. It filled the whole thing clear to the bottom with NO MESS. You may have to cut a hair more off the cart for boge cartos, so the end doesn't touch the batting, or you won't be able to blow in it. For someone who hasn't seen a cart, the reason this works, is becase there are two channels that run along either side that are used for airflow when you are using it with a atm. My way forces the liq to run down those channels into the outer edges of the carto automatically.
Try it...you'l love it. I hopes this helps somebody
Try it...you'l love it. I hopes this helps somebody