I have an old 2 stroke (FD20C) a late 50's 20 horse Johnson. The handel broke just inside of were the tiller mounts to it. I was able to buy a new handel. The manuals I have access to do not show how to break down the unit to remove and replace the handel. Can't tell if it's downward from the power head or upward from the shaft ect. How do you R&R the handel?