Anyone have trouble with their Barely Crusher not crushing grains? I've had it stop in the middle before but I've always got it going again. The rollers simply won't grab the grain. I took it apart completely, cleaned and dried the rollers, re-set the gap, still no crush. I can get them to grip for about an ounce of grain and then nothing again. Are the rollers simply worn out? I've probably put about 1000 pounds of grain through this. Doesn't seem like all that much.