It has knives copied from the original Mott/Alamo design. Interesting is if you don't have them at a high enough speed the bend in the knives can actually stretch and move. It's more prominent on the lighter duty units with narrower knives. 100 thou out is a lot. You need to take it apart and take the cutter shaft to a driveline shop and not only have it straightened but get it dynamically balanced as well. This is where they might have to weld weights on to balance it. You'll have to take all the knives off. Missing a few knives can also throw it out of balance. Probably want to install new bearings as well. My dad set sales records for Mott Interstaters. Kept a spare cutter shaft in stock after some bozo hooked a tow strap to the 4 1/2" cutter shaft on an 88" rear unit with 74" right and left side hydraulic cutting units. It's a pretty good pull when an MF275 tractor with duals on the back and 3 flail mowers gets stuck in the mud. Definitely in the running for one of the best Darwin awards. Spent a few weekends as a kid putting knives on Mott flails. Used a greens mower tire as a stool to sit on.