This shaft assembly drives the metering or conveying components within the corn header. It transmits rotational force from the drive system to the gear train that moves the gathering chains or snapping rolls. The integrated 13-tooth gear mates with the adjacent driven gear in the header gearbox. A worn or damaged gear tooth profile causes skipping or uneven load distribution, which can lead to header plugging or chain slip. This original component is machined to match the gear mesh geometry of the factory assembly, ensuring proper backlash and alignment without shimming.