I just glassed in my new transom 2 sheets of 3/4 ply 1 1/2 thick. The drains I am looking at, the kind with the screw in plug, do not go all the way through the transom. The old one I took out was only 3/4 inch long which is why my transom rotted out at the bottom. I found one at boaters world that is 1 1/4 long. Has anyone found one longer? What are you guys installing in yours, I mean most transoms are at least 1 1/2 arent they?