I just got off the phone with my dealer and he said that the bottom two bolts are actually screws that are screwed straight into the fiber glass. No nut at all on the other side. He said I'm in no danger of it leaking, just of the platform falling off if I continue to surf with the broken screw. He quoted me at 450 bucks to fix it, that's pulling carpet, cutting access hole into the floor, removing the foam, getting old screws out, and installing new bolts with washers and nuts that are stronger than the original screws.