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I am a newbie -- so be gentle. I have an 1987 Sport and I just bought a MotorGuide bow mounted trolling motor. The "footprint" for the "Gator" mount is just the size for that flat area outside of my bow rail -- but of course there is no underside to the deck. The instructions for mounting the plate call for nuts and bolts through the boat deck Can I screw into the deck with SS lag screws? It there plywood under the fiberglass?