Next step was to get the rotted wood off of the outer wall of the transom, without damaging the figerglass. I saw no need to cut out the whole thing, since the outer wall of the transom is in excellent shape. We started at the top with a wood chisel. We drove the chisel in about half its length, and worked it back and forth, which started to separate the rotted wood from the glass. If you look down and to the right of the chisel, you can see the brass tube of the splash well drain. Almost half of the wood came off with the inner shell. Next step was more of the same, just bigger. Dad sharpened the end of a piece of 2" X 1/8" flat steel that I had in the corner of the garage. He put a chisel edge on it. With a small sledge hammer, we would drive it down between the outer shell and the rotted wood. We started with about 8 inches. Then we would work the bar back and forth to break the wood. Then pull it out, move it over about a foot and repeat. We worked the bar down in three passes, until we had the bar all the way down to the bottom of the transom.