Yanmar Saildrives all require this collar to be fitted over the spline and transfer the forward thrust of a propeller to the Saildrive.
The following parts diagram and drawing show the thust collar required on Yanmar Saildrives. A similar part is used on Volvo Saildrives. Item #'s 43 and 50 are replaced with a nut and M8 locking cap screw supplied with each Saildrive mounted Kiwiprop.
