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WARNING: Proper shoulder strap and handlebar adjustments must be made with the engine completely stopped before using unit. The shoulder strap clamp must be installed as shown above the handlebar on the upper shaft (powerhead end of unit). NOTE: The lower shoulder strap clamp has two spacer tabs attached. These tabs are provided to adapt this attachment for use with powerheads that have a 1. (2.5 cm) diameter upper shaft (the shoulder strap clamp will not tighten down securely on the 1. (2.5 cm)