I ran at least 3000 pounds of malt through my Barley Crusher and totally wore out the knurling - in one direction.
After I bought the CK mill to keep things moving in the brewery, I took the BC apart and flipped the rollers over so the opposite edges of the knurling were in play. It then pulled as good as ever - but required the power source to run in the opposite rotation, which for my gear motor would be a disadvantage as it produces about 20% lower torque when run in reverse from its best direction.
So the BC is now set at an 0.025" gap for milling wheat and oats, driven with my DeWalt 20V drill, allowing me to avoid re-gapping the CK. Life is good
Cheers!