Zassenhaus knee coffee mill grinds too coarsely

I have a Zass and sometimes have a problem with it self adjusting, but when I do need to adjust it, I find that I have give it a good tap on the top to make sure it adjusts. So, just turn the knob counter clockwise as far as it will go, then give it a good knock on the top and bottom and try again. My mill offers the full grinding range, from a fine powder to large chunks.