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Instead of the knife being pressured into the rotor, the knife is set up with a cam clutch tyre system. The spot-on triggering, without the spring counter tension, means a foreign object will trigger the knife to roll out of the work position, thus only blunting or damaging one point on the blade. A conventional knife protection will cause the foreign object to travel the entire length of the blade before releasing it, blunting or braking a large portion of the blade.
