The "Thingy" is the best method IMO, The carto is filled
through the holes the way its supposed to work and youre ensured that all the material around the coil is saturated. There is plenty of visual, you can see the air bubbles come out of the holes and after 8 or 9 twists just take the cap off and look down the carto if the top is saturated youre done. The liquid came in
through the holes that its drawn through while youre
vaping so no chance of a dry burn, no need to let it sit for 30 minutes etc.. You can flood the carto with this method until you get the hang of it but it's so easy to rememdy just blowing through it, i'd much rather take a chance of flooding a carto than getting a dry burn and ruining it. Different strokes for different folks but it's virtually impossible to ruin a carto this way. And in 20-30 seconds you're done, no patience necesarry.. I'm way to impatient to drip into a carto to fill it lol.