4 inch hole saw to begin the installation. Wanted it mounted as far aft as possible.
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Had water intrusion into the balsa core where the gas tank brackets were screwed in so I drilled those areas out with a hole saw.
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Marking the spot where the transponder base will be mounted.
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Notice the three holes where the bilge pump was mounted. Another potential water leak into the balsa core.
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Cut into the lower area where water collects for the bilge pump and drain plug area so no puddles will form around the transponder mounting.
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Spent most of the winter drying out the core with a heat gun shooting into the holes when I had spare time.
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Mounted the transponder base to the bottom of the boat with a thin bead of silicone to hold it in place, fiberglass resin will be poured around it.
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Undercut around the hole to give the fiberglass resin something to hold onto.
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Cutting out the 3 screw holes for the bilge pump mount to screw into solid resin.
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Ready to pour the fiberglass resin mixed with colloidal silica.
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Resin poured.
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Test fitting to make sure the transponder fits onto the base without hitting the resin.
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Filling all the holes with fiberglass resin.
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A whole buncha holes filled.
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Sanding the deck flat.
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Ready to finish the fiberglass surrounding the mount.
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Used an old piece of line to ensure the shape of the cutout is somewhat the same all the way around.
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Fiberglassing over the line.
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