A few years back, I had a Morbark 15 self-destruct when a knife broke while chipping. A scary experience with sharp metal flying in all directions. It was a knife that had been sharpened at least once or twice. I don't know if the knife was defective from the start or if it was compromised by...
I gave up on sending them out for sharpening many years ago. Just put new ones in every 6 months or so. Never have to reset the cutter bar since the new knives are always the same size.
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