Morgan 33 O.I. Perryville
Join Date: Dec 2010
Thanked 200 Times in 178 Posts
Rep Power: 6
Re: Need an engine part that apparently doesnt exist anymore
If I recall correctly, the plastic cap on the back of the nut was nothing more than a decorative cone that was held in place with a cotter pin that went through a small hole the prop shaft. It really does nothing to enhance the performance or prevent cavitation. Just get an ordinary castle nut and some cotter pins to hold it in place when you shift to reverse.