The mounting joint has a first and second axes extending at right angle from each other. A shaft and bearing assembly extends along the first axis. The shaft has a crank arm on its end for controllably rotating the shaft axially about the first axis. The mounting joint also has a resilient wrist pin assembly mounted along the second axis. The resilient wrist pin assembly has axial resilience about the second axis. The first axis extends horizontally. The second axis always lies in a vertical plane. The shaft and bearing assembly has a first connection for connection to a supporting beam and a second connection connected to the resilient wrist pin assembly. The resilient wrist pin assembly has a third connection connected to the sickle bar, such that the sickle bar is controllably rotatable about the first axis and resiliently rotatable about the second axis.
