Router out a couple ply's off the underside of your new deck pannel, Glass in a large piece of aluminum, (larger than the base of your seat) then drill down and tap the plate from above. You will still need to seal the holes from the top to prevent water from running in. It takes some planning, but IMOP its the strongest way of doing it.
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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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