at the beginning, so good: when it is full it mout if it is not too tight the top button. Later, when there is less salt, the "worm" does not have enough material to push down and, in addition, the finer crystals clog the mill the bottom and create a plug. The solution is to return the mill, type a little above, sideways for "remix" the salt crystals and it works again. In addition, you should reload before it is empty for precisely that the screw plays a full role. voila, it's a bit of stress but it really of sea salt on his plate.