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For a safe operation of the trimmers it is important, that the knife guard is not taken off. The knife carrier (#3) is fitted with a friction device. If adjusted correctly, this friction device insures, that the knife carrier (#3) with the knife cannot move down on its own from any position. If the blade and blade carrier fall by themselves the friction device must be adjusted as follows: For the model 1038 loosen the set screw (I). Tighten the lock nut (II) and retighten the set screw (I). F