I purchased a Kanger Subtank Mini yesterday. When I got home I took it apart and noticed that the base (deck) did not threat smoothly. It squeaked and was hard to turn in spots. The squeaking has ceased but it still turns hard in spots. Hmm. I took off the coil and threaded the base onto the tank and it threaded smooth as silk. Put the coil on, and it threaded hard in spots again. This leads me to believe that the chimney tube may be bent. I went to YouTube and found a video describing the same issue. It works fine...at least for now...but this is a concern. Thinking I should return it to the shop where I purchased it. Just curious if anyone here has encountered that problem. Please advise.