Hmm Biancamontgomery made a video .. I'll see if I can find it. basically you pull it all apart. Rinse. Then you put the grommet on one end of the new carto, then you slide it into the
tank. then you put the other grommet on. then you wiggle it all around till it fits. and hope it is air tight! You'd think that since those grommets hold the carto in a death grip that they would be air tight, but I found that in many cases.. they eventually flood. The culprit is air coming into the tank, through a break in the grommet's seal. I didn't find it hard at all to put it back together but I've read where others did. Once you get it together and fill the tank, vape in front of a mirror, watching the seals closely.. if you see any air bubbles coming through the seals as you vape.. it will leak (sooner rather than later) the air leaks will cause the pressure inside the tank to build up until that pressure forces the
juice into the punched hole in the carto and out the bottom of the carto. Not pretty or fun. The fill hole can be used to maybe even out the pressure but if there is an air leak the pressure will keep rebuilding and flooding will follow.
When I find that video.. I'll post a link.