It comes apart and there are notches that need to be lined up for the JFC
Here is the full assembly and disassembly that I did
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Oh... It can be taken apart. Nice...
So I just did it,... Cleaned it, checked it, indeed a tiny thin o ring inside, No issues whatsoever. I built it up again, filled the tank with 4ml in a really fast way and.... It still juicing up the coils with the JFC fully closed while vaping. Air bubbles can be seen floating up with the JFC in closed position. However, this time no leaking from the air flow openings.
It still has a leak inside so I bet I'll make a mess again while I refill somewhere today...