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B45045 Part number: 72451-17203 Figure 23 Cutting Grass—Units equipped with a trimmer head Your Shindaiwa unit may be equipped with one of several Shindaiwa trimmer head models, each with features for specific applications and/or operational requirements. NOTE: For proper operation, always refer to the instructions accompanying the trimmer head being used. Available trimmer head styles include: n Semi-automatic. Trimmer line is indexed when the operator taps the trimmer head on the ground during