Had my 96 Islander transom rebuilt in April 2017. The company asked if I wanted to go back with wood (plywood) or coosa, I went back with wood. Called Grady and bitched at them a little and they sent a new transom cap they use in present production boats. Made transom a little thicker than original, top was glassed closed, then put the Grady cap over that and sealed. Before we got the Grady cap, we were going to close the top and gelcoat but glad I installed the new cap. Gives me a little more protection of transom on top. Cannot remember what he used to secure the new cap, just know there are no holes on the top of transom. That aluminum strip that Grady used back in the day was maybe being used for protection of the transom but as soon as you drilled into the transom, that helped start the process of water intrusion. No issues after two years now.