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Message: <blockquote data-quote="thill" data-source="post: 502928" data-attributes="member: 4972">I would drill and use the 1/2" that you already have.  Most boats don't even have a block on the outside, so if it covers the holes, even by a little, I'd be happy.  The inside blocks that distribute the load are the ones that really matter. Do seal everything.  Clean up the area, (soapy water, brake or carb cleaner or whatever) and put plenty of clear silicone or E6000 under and around it, and then clean up the excess with paper towels and Denatured Alcohol before it starts to skin over.   It will be fully dry by the next day.And that will be the end of that.</blockquote>