I cut an inspection port this afternoon. It doesn't look so bad from the outside of the tube. I am sure that once I am done, the outside of the tube is going to be one ugly work of art. I purchased some epoxy 105 and some 205 hardener, along with 10 feet of 6" woven fiberglass tape. I think I an going to center the mast in the tube, while it is wrapped in a bunch of wax paper and then just wrap everything in tape and epoxy. I haven't bought any filler for the epoxy, but I think I will mix up some peanut butter consistency epoxy and pack it around the bottom of the tube. My main concern is where the tube attaches to the deck. Most of that area is missing, but the same approach or a wooden donut may also work. I will post some pictures soon. I am not sure what the previous kids did to this boat, but it must have close to a gallon of dirt just rolling around inside. Not really sure how to get that out, but will think of something. Also, the inside of the boat is wet, and I don't have a garage to store the boat, so it may be a while until I actually work with the epoxy.