good info - mine eggshelled last year on 4th of July @ about 9pm doing 25 MPH - replaced it and back on the water next day - with alot of help from the good folks on here!
and the point about the noises and knocking is soooo correct... too bad for me I had no idea what the heck was about to happen...I'm so much smarter now...LOL
and it's a relatively simple task - simpler if you have a forklift!