Abstract: A trolley assembly for a conveyor system includes a pair of trolley arms having wheels for rolling engagement with a track or rail of the conveyor system. A trolley attachment is adjustably mounted to the trolley arms and adjusted relative to the trolley arms to adjust a position of the trolley attachment relative to the wheels. The trolley attachment is positionable at a selected one of a plurality of vertical positions relative to the trolley arms and the trolley attachment is retained at the selected one of the plurality of vertical positions by engagement of the trolley attachment with the trolley arms. The engaging elements of the trolley arms or attachment may comprise projections, and the engaging elements of the other of the trolley arms or attachment may comprise recesses, with the recesses receiving the projections when the trolley attachment is positioned between the inner surfaces of the trolley arms.