for those who want a very fine degree of grinding: Screw out ring completely screw back one turn ... Screw in and at level 25 should come out useful ... just before look without the bean container if all can turn on fine otherwise there is risk of "sanding" ... After each further coarser to the desired freeness achieved otherwise it was with me so that actually came out of the dust was not to break through with 15 bar (but was well pressed;)) ... but one probably that's what most Espressomahlgrad understand.
