A cutting assembly for a portable hand-held power driven working tool may include a first elongate cutting blade and a second elongate cutting blade. The cutting blades are arranged to be connected to a gear, causing the cutting blades to move in a reciprocal manner along a longitudinal axis of the cutting blades. The cutting blades are arranged to be mounted so that an interior surface of the first cutting blade faces towards and abuts on an interior surface of the second cutting blade. At least one of the cutting blades has a recess extending in a longitudinal portion of the interior surface of the cutting blades, such that a gap appears between the cutting blades when they are mounted in a face-to-face relationship. The gap prevents the flow of the grease from the gearbox beyond the position of the gap on the cutting assembly.