Sorry, I had to break it up.
It is perhaps interesting to see that the outer rim of the burrs is not machined flat, as it is on larger conical burr sets (and on flat burr sets too). I am not sure if this is a good thing. Have a look at this one, where I hold the burrs as they are meant to be mounted. No, that is not a piece of dust between the inner and outer burrs, above my thumb. It is a piece of sky.
I imagine that some grinds ought to slip through in that size, even though the burrs touch?
Having a look at the burr edges, they aren't exactly straight. Nor are they very sharp, but maybe sharpness is not as important as one might think? This would never do for a flat burr in my Anfim though.
Here is a dirty one as a bonus for you scare freaks. Doesn't the metal look like it is about to come off in some places?
Aaaand, we have a winner. Once the angle is right and the light is OK, it should be be beyond any doubt that these burrs are worn, man. The upper ("shorter") indent is from the rim of the inner burr.
If the Zass turkish grinder is designed to grind with the burrs touching, as it says on the sweetmarias site, then either
1. Zassenhaus think we need more metal in our coffee or
2. Something is not right with the burrs. Perhaps not only on mine?