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Possibly, but the brackets that hold the knives are bolted solidly into the drum. Shimming them would be a fair amount of effort and may change the load forces which could damage/crack the drum. Easier to just replace the knives 3-4 times per year at $250 per set.

Back to the thread topic of chippers, I have an early model Morbark drum with a feed wheel. Been very happy with it but knives are a constant expense. I quit using sharpened knives early on because they simply do not chip as well, and I figured out why. Consider a saw chain and the angle of...

Tracks are only an advantage in dirt. Wonderful for construction sites, terrible on lawns. How much golf course equipment do you see with tracks? I would never buy anything on tracks for residential tree work.