HA-0042 is the Olympic Gear Reducer for the Balemaster Balers needle and twister assembly. Its compatible Balemaster part number is DAA00042 and DAA00040. This part will fit all Balemaster Balers. There is 2 of these per baler. 1 for to control the needles in/out and 1 to control the twisting and cutting of the wires. If the gear reducer goes bad make sure to check the Motor Brake as that can cause premature failure. If you have any questions about the part please do not hesitate to call and speak to one of our parts experts at (844) 302-4881