Nautilus tank bottom popped off and I cannot reassemble it.

I've had my Nautilus tank for about a month and have enjoyed it thoroughly, unfortunately, while in the process of unscrewing the tank to refill the liquid, the bottom most part of the tank (for lack of a better term) 'popped' off. After the bottom popped off, the air flow adjuster and subsequent spring lock also came off.

I have attempted to reassemble the tank and it's mechanisms but the bottom most cap/screw part refuses to reattach securely to the base of the tank. I do not know if this was a fault in the product during manufacturing or a misuse on my part but I really do enjoy this tank.

As of right now, I cannot make any progress with fixing this tank; would it possible to ship it back to manufacturers?
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