I'm trying to replace my impeller today and have gotten stumped on the shift linkage disconnection. I can see the cotter pin at the top, way under the powerhead, and also see the jam nut just between the lower unit and the cylinder it goes up through. But for the life of me I don't see an easy way to get it apart. The motor is a 2007 model, 50 hp 2 stroke. Any help is appreciated, Thanks!