You leave the old trim on and lock it all down. I did one on a small Force motor. Made an aluminum strap to hold the old trim down, going from one side of the transom mount, behind the swivel bracket, and back to the other side transom mount.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD