Chris, are they locked down with lock nuts inside? What is the fastner used in that location?
If there is lock nuts, I would use a new set of lock nuts and possibly a second to back it up. Typically once a fastner is locked down, they dont give up very easily. I would also use fender washers on the inside, to help spread the load it is under. Dont know about your boat, but mine had regular washers all over and they seemed to want to try to start pulling through. When I redid my entire boat (CP19) I used fender washers where I could in order to avoid having things coming loose at any time.