I have a 60 hp Yamaha and I am unfamiliar with the type of prop nut that is currently on the motor now. The prop nut is round in shape and about 3'4" thick, it has 2 small holes on top that I assume are for a special tool for removal. But the part that really has me stumped is how to remove the cotter pin. The head end of the cotter pin is made out of the same material as the round prop nut and appears to be just has thick. It does have 3 small holes on the top of the cotter pin. I tried tapping the cotter pin out, but did not really try to force it out. Any help would be greatly appreciated.