The 7x7" pedestal seat bases on my 03 G-3 are rusting out. I can possibly replace the brass inserts, but some of the SS base screws won't get tight. I assume I could install larger screws to get them to set tight to the deck? The original screws are 2" and I assume screwed into the wood under the the deck so I'm wondering if the larger screws will hold in just the metal of the deck?