Captjames,
If you look at the rub rail it is actually a two part deal. The center section is called the insert. The insert covers the screws that hold the major portion of the rubrail on.The termination of the rub rail and the insert is on the transom.Look for a vertical seperation in the insert that has a screw securing it on both side. Remove one screw and use a pair of needle nosed pliers to carefully flake the insert out of the rub rail.You should start seeing screws about every 8" or so. That is what hold the rubrail on and on smaller boats is the deck to hull connection. The 31 may be bolt (machine screw and nut) through and not just screw through.If you have a marine Catalog for boat parts such as West Marine, in the 2006 cataolog page 486-487 shows the rub rail and the insert. However, Ir you need to replace, I would call Rudy.Hope that helpedr.w.landau