I've gotten poor crushes from the Milwaukee NB store. The mill hanging on the wall behind the cash register gave one of the worst crushes I've experienced. I notified them of this the next time I was in their store. They thanked me and said they'd look into it, which I have no doubt they did. The people who work there are very nice, and very responsive.
And the earlier poster is correct, the mills in the grain room are locked and not adjustable by the customers. When I was there last Friday night, both mills had a stone in them, nicely rounded by having been in the mills for so long, and behind a screen (probably to catch stones!) so they're impossible to remove without tools. No telling how much the rollers have worn away from the stones, nor how long it's been since the gap was re-calibrated.
I did notify someone at the store about the stones, who then got some tools in order to remove them, but by then the mill I had been using had crushed the stone along with my grist. Again, they are responsive, but this equipment is used by anyone who walks into their grain room, and they do permit you to bring in your own barley and crush it in their mills, which is unnecessarily generous of them.
But, the solution to this is to get my own roller mill, which I will eventually do. On an impulse I bought a Corona, but the thought of rubbing two ill-fitting pieces of galvanize metal against each other just doesn't instill confidence that I won't be getting galvanized metal in my mash.