After reviewing the threads here on grain mills, I broke down and bought a Corona for about $50.00. I assembled it but haven't used it yet. I have a question with respect to adjusting the plates or disks or whatever you call them. Palmer's book states that the plats should be .035 to .042 inches.That's fine but a Corona Grain Mill is not a precision piece of machinery. If I use a feeler gage and adjust the 2 side nuts to .045 the middle seems to have a lot more space between the Plates. How do other brewers adjust the plates to get a good grind. Do You use a feeler gage and if so here do you measure, on the sides or in the middle" Do you just play it by ear? Do you use different settings for different grains?