The only trouble we have ever had with the lucke pans are them coming loose on us,,,we solved this by welding small flat irons at the back of the pan and attached to the next pan,,,,in sections of 2,3 and 4 pans,,so you can still take off a section to work on the cutting bar..Thats about it,,nothing really to go wrong with them,,,Oh also we took small washing machine bearings and put them on small bolts and welded those to the front of the pans at the tip to prevent the sunflowers from getting knocked over as the pans went through the crop. They help slide the stalk around the tip and into the knife.