mine didnt have indents even.. and i tried the needle pierce thing.. and yup i remember someone mentioning no air flow and i suggested checking for draw holes LOL...never heard if that was the solution or nt..
btw got the recommended Diamond Xls omg what a huge difference in vape time and my tanks are trouble free thanks to your vids.. is there a recommended clean the dual coil cart schedule?? if im always vapng the same stuff in it can i just leave it and use it for the 60mls? or should i be cleaning it every 30ml anyways???