Try running some hot water over the base (after removing clearomizer from battery first ) then, if it's still not cooperating I'd use a couple of small pieces of rubber shelf liner to give you a better grip. In a pinch, wind a couple of rubber bands around the base of the clearomizer and the main tank. That should help?
So this is a problem I've had with a couple of different types of bottom coil clearomizers. After a few uses, the base portion where the atomizer coil is located will get stuck (making it really difficult to clean out between uses). I think it is because some of the juices will leak through, making it sticky. When that happens, usually the only way I'm able to unscrew it is with a good amount of effort and a pair of pliers, which often leads to some scratching.. Has anybody else run into this problem? Is there an easy / damage free way to get the base unstuck when it happens?