This left-side flail is the impact element mounted on the threshing rotor within the threshing mechanism. It strikes the crop material against the concave grates to separate the grain from the straw. The flail pivots on its mounting pin and swings outward under centrifugal force as the rotor turns. Wear on the leading edge reduces threshing efficiency and can leave unthreshed heads in the straw walk. As an original component, the flail matches the original pivot-hole geometry and mass, which keeps the rotor balanced and the threshing gap consistent across the drum width. On reinstall, ensure the flail swings freely on its pin and that the retaining hardware is torqued to specification.