I have recently purchased a Catalina 400 after having a Catalina 30 for a number of years. One thing I have found is that the inner mounting of the stanchions is actually a self-tapping screw into the deck. These screws are now spinning in the hole and need to be fixed. I would like to through bolt them, but can not seem to get to the underside of the deck unless removing of most of the interior. Has anyone else had the same issue? What has anyone else done to rectify this situation?