Ah, you've tightened it too much... This is a common occurrence for many vapers. When the clearomizer is tightened too much during reassembly, it can jam during use because of the heat released by the coil. You can place your clearomizer, without the battery, in the freezer for 20 to 30 minutes to shrink the seals. If this solution doesn't work, you'll need a pair of pliers and a cloth to unscrew the whole thing. We advise you never to overtighten your clearomizer. When you screw it in, when the assembly stops turning, don't tighten it any more.