Hi, I have an account with TW and bought 5 of these clearos in the yoyo sales!! Love them to bits, but the first one i opened and filled put on my ego twist... no air draw at all... after removing and checking i realised that the bottom bit that sits on battery has not got groove cut out like normal. Do you guys not have a quality control check on these things, as that one is completely useless to me! I know they are not that expensive but still feeling ripped off! Maybe you could let me know how to cut grooves out of it? 