Anyone fasten their plywood/2x4 deck to their frame with these type of fasteners? I'm assuming you only need to drill the pilot into the top of the frame, since their self-tapping. And since no nut is required, will be more water-tight (with caulking/silicone applied to the bolt). I'm just wondering if they will eventually "shake-loose", unless lock-tite(or similiar product) is applied to the threads....