One of my outer teak rails is separating from the hull. I am using the term “outer teak rails” however in case it’s the wrong name, I mean the teak board which is affixed to the outer part of the hull and runs fore and aft. The teak board is not yet in any danger of falling off but it needs secured. It looks like these boards are screwed on. I was wondering if any of the other owners have considered using bolts with an external flat head to secure these rails and if anyone can advise of what bolt type was used?