I have a 1958 west bend/elgin 12 horse motor that has finally broken. It runs great but something has broken in the drive. I hit a sand bar, the shear pin bent a bit but did not break. The motor died and when restarted surged and made some bad noises... clanking. I popped it into neutral and it it made one last noise and then no drive at all. I am very mechanical but have never dis-assembled a outboard drive before. Any suggestions, guidance, advice... is greatly appreciated. I love the old motor and it's the orriginal setup on my 14 foot boat. I don't have a book but will try to find one as I am sure I have no hope without good information. Any suggestions on the best book? Thank you.