Check on the shaft they are mounted on and there might be a bolt that goes all the way through it. If so they are shear bolts that can break if you get something stuck in the blades. Just replace the bolt if broken or missing.
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Check on the shaft they are mounted on and there might be a bolt that goes all the way through it. If so they are shear bolts that can break if you get something stuck in the blades. Just replace the bolt if broken or missing.