Hello everyone. I recently bought an M17 and am in the process of repairing and repainting. I have come across something curious I need help with. There is a small fin keel that extends from the keel aft along the center line, to the transom. It is only 5 or 6 inches deep at this aftermost point. Mine looked a little beat up so I thought I’d have a closer look. I drilled a 1” hole in the side, near the transom, and to my surprise, the fin is hollow. Mine, however, contained mud and water. I vacuumed out as much as I could but need to know how mud could have gotten into this “keelette”. The hollow space goes all the way to the keel itself. I can’t see under the cabin sole to know whether the hollow space connects with the cabin. Can I flush it out with water (it was already wet so what the heck)? How can I keep this from happening once I repair this fin? Thanks in advance, AL in MPLS