The 1972 mako and 1972 SC 23 had a almost UN-noticable difference in hull thickness in stock form which really surprised me. (I had drilled thru both hulls at one point sitting side by side) The half inch holes were definitely there from the factory, as the deck had never been pulled up and the areas where they were located were not accessible with the deck in. (under the tank platform) Seeing as how this is a very early boat, they could have changed the practice over time and used 'glass straps' instead.
Do not misunderstand me, I do NOT think the damage that the Mako sustained would ever be possible on a SC, because of the fiberglass boxed stringers. BUT anything is possible. This is a VERY VERY common problem with older Makos, because of the wooden stringers.
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Patrick from WAY out on cape cod.
1973 23foot Center console, Birdsall Ttop, Hermco Bracket... in progress
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