Maybe I'm wrong, but I think:
Leaking on Ithaka connector could happen only because:
1.- Center post O-Ring is not sealing properly with Ithaka's base.
2.- Through the center's post inner hole.
Causes:
1:
-Damaged O-Ring
-Center post not properly aligned
-Ceramic assembly not tight enough (so center's post o-ring can't seal properly)
2:
When the liquid level in the
tank is higher than the center post top nut and:
Center post top nut is in closed position:
you fill your tank with liquid and liquid has free flow to the the small collector tank (because there is space in the ceramic channels (thin wicks)) , so it will become full of liquid while refilling, if you open the mouthpiece too much, liquid will enter into the ceramic cup eventually filling it, to finally come out through the center post.
you fill your tank with liquid, if you open the mouthpiece too much, liquid will enter into the ceramic cup filling it, the liquid will come out through the center post.
Center post top nut is in open position:
you fill your tank with liquid and it has free flow to the the small collector tank (because there is space in the ceramic channels (thin wicks)), the small collector tank will become full of liquid while refilling. Liquid has free access to the ceramic cup (because center post top nut is in open position), liquid will come out through the center post until the level of liquid inside the tank is bellow the top of the center post top nut.
you fill your tank with liquid, and you open the mouthpiece too much, excess liquid will enter inside the ceramic cup, due the center post top nut is in open position, that excess liquid will go inside the small collector tank, when the small collector tank is full of liquid and the level of liquid still higher than the center post top nut, liquid will come out through the center post.
In all the above scenarios the liquid that is comming out has to be replaced with air (of course, while refilling there is plenty of air supply because top of tank is open

), in theory if the tank is sealed (small tank top nut tight) liquid could not come out.
Sometimes liquid comes out while screwing the small tank top nut beccause the pressure of air inside the tank (air will push the liquid out).
While vaping the liquid gets evaporated, air has to enter inside the tank to replace the evaporated liquid. There is always a small air bag inside the tank, even when we fill the tank to its max capacity. Due when vaping we move the atomizer in different positions, that air bag and liquid moves inside the tank and more air will eventually enter through the top of the center post, it will find its way to the tank.
I know I'm over thinking things, I just like to thing about how it works
I'll keep thinking
