last year when we got the header out they were froze up and the end was broke off the end of the cylinder, jd wanted over $200 for the cylinder so we just welded it back on, I've noticed this year the plates are getting tighter again so next year we will probably remove and clean them before the season. I most have picked up one heck of a rock this year because I have one plate that is broke, and the rollers are scared in the same location.