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Trombone rotor swivel arm. IMPORTANT NOTE: In 2009 Holton made a design change in the rotor assembly and the direction of the slot in the swivel arm that fits over the rotor stem was reversed. Older model instruments may have the slot going in the opposite direction and will not work with this swivel arm. See picture (click to enlarge) to determine if this arm will work for your model. Note that the older design swivel arms are no longer available.