This brass bushing acts as a replaceable wear surface in the cutterbar drive assembly of a grain harvester header. It supports the rotating shaft that drives the knife, reducing friction between the shaft and the stationary housing. As the bushing wears, clearance increases, leading to vibration and uneven cutterbar motion that degrades cut quality. The bushing is machined to the original shaft-tolerance specification, so no shimming is needed during replacement. On installation, verify the bushing is fully seated in its bore and lubricate the inner surface before inserting the shaft.