I just got the Protank 2 rinsed it out, put it together, filled it with liquid and started vaping. It performs great but when i looked in the tank (merely admiring my new toy) i noticed that there was still thread showing, as if i hadn't screwed in the end cap of the tank all the way. Now, i thought this was the problem at first so I drained the tank and unscrewed the bottom section of the tank and tried re-aligning the threading and hand tightened it. Still seeing threading on the center tube. Does anyone else have this problem? i don't want to overtighten it and mess up the threading. Any help or feedback is appreciated.