GWS - 9/2/2013 08:12 If you're buying a used roller mill, look closely at the wear pattern on the rolls. With a lot of use, it isn't uncommon for the rollers to be so worn in the middle (where most of the grain feeds) that smaller kernals will pass through unmolested, even after the rolls are set as close as the edges allow them to be. Hammermills are easier to maintain. Just turn the hammers when they get worn, or put in new ones, and you're good for a long time. Sounds like you need a hammermill with two, or more, screens.