Looks like there's another hole about an inch from the one that goes all the way through. If you don't want to install a through hull just yet, you can squeeze some 3M 5200 sealant into the hole and then run a screw into it. I wouldn't use a screw longer than a half inch. You don't want it sticking out the other side.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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