This cutterbar header component is the knife-head assembly that connects the drive linkage to the reciprocating knife section. It transmits linear motion from the wobble box or crank arm to the knife sections, converting rotational input into the back-and-forth cutting action of the sickle bar. The assembly includes the mounting points for the knife sections and the connection to the drive rod. Wear at the pivot bores or the knife-section attachment points introduces play that reduces cutting efficiency and can cause uneven stubble height. The manufacturer machines the bore and slot geometry to match the original drive linkage, preserving the correct stroke length and timing of the knife action. On reinstallation, ensure the drive rod clevis pin is secured with a new cotter pin.