The project started as a simple cutlass replacement but after pulling the bronze stern tube and getting a good look at the amount of corrosion inside, I decided to retire it and install a fiberglass tube. Thankfully many here have posted some great info and I've linked a few threads below that I've looked to for advice. Replacing Stern Bearing Housing and replacing with a FRP shaft tube lossing the log and giving the shaft a tube Shaft logs After speaking with Rose's and reviewing available tube diameters, I decided to make my own tube to $ave and to match the orifice in the keel. The 1708 was wet out on the table and then rolled onto the steel mandrel. It worked out ok but the fiberglass became bunched at the edges. In the end it didnt matter because the edges were cut off. It was a major pita to remove the mandrel. I ended up having to pull it out using two cars. The tube is at the machine shops now being bored and faced.