In my experiments on a 169DG mill, from the point that the burrs are as close together as they can be (the adjustment nut turned all the way counter-clockwise), I turn the knob approximately one full turn clockwise to get a good starting point for french press grind. On these mills, when you go from a finer grind to coarser, you may need to tap on the top of the adjustment mechanism to drop the burr down. What you want in any brewing/grinding situation is to grind as fine as possible for maximum flavor extraction without causing over-extraction or an unacceptable amount of sediment in the cup. Obviously these can be subjective determinations - so you will have to play with the settings to find what you like.