So today I dropped my mod out of my pocket for the second day in a row. Yesterday I dropped my ProVari a good distance and bounced it off a rock, walked away with a missing window and a mod that still works perfectly. However I noticed my nautilus acting up a bit. My airflow control was sitting a little low, and my coils wouldn't push the connector pin all the way out.
Today I dropped my mod again, just to the floor, but it was enough to split the Nautilus apart. With horror, I though that maybe I had stripped the threads off the tank, as has happened to me before with an MVP and a Protank. I picked the tank back up and found out what happened.
The very bottom of the tank, below the airflow control, where the connector goes in, is actually a cap that connects to the rest of the base hardware. It's a small cap, only containing the connector pin and spring. When the cap is in place, the spring makes contact with the bottom of the coil and causes your contact pin to extend. With the cap off, you can see the bottom of the coil. The connector pin makes contact with the battery, passes current through the spring that goes up through the bottom cap, where it makes contact with the coil.
The cap wouldn't go back on by hand, so I used my knife as a hammer and forced it down as far as I could, it should go all the way back on. I threw it back on my mod, checked the resistance, then fired it up. Tank works flawlessly again.
So in summary, if the bottom cap splits from the base hardware of your Nautilus take heart, as long as the connector pin is still there, you can put that cap back on and keep vaping.