I'm having trouble with my barley crusher. It started during my last brew where it would periodically stop crushing, but now it won't crush at all. I ground 4 pounds of grain this afternoon, then went to put in an additional 5 of base malt and nothing happened. The main roller will spin but the slave roller won't pick up anything, neither with the drill nor by hand. Occasionally If toss a handful of grain in the slave will pick up, but it will quickly stop again. Any tips as to how to fix this? I've tried adjusting the rollers, everything from 9 o'clock to 3 o'clock, to no avail.