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 Shoot Through The Hull Transducer Installation 
4 inch hole saw to begin the installation. Wanted it mounted as far aft as possible.
4 inch hole saw to begin the installation. Wanted it mounted as far aft as possible.
Viewed: 532 times.

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.
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.
Viewed: 440 times.

Marking the spot where the transponder base will be mounted.
Marking the spot where the transponder base will be mounted.
Viewed: 413 times.

Notice the three holes where the bilge pump was mounted. Another potential water leak into the balsa core.
Notice the three holes where the bilge pump was mounted. Another potential water leak into the balsa core.
Viewed: 433 times.

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.
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.
Viewed: 407 times.

Spent most of the winter drying out the core with a heat gun shooting into the holes when I had spare time.
Spent most of the winter drying out the core with a heat gun shooting into the holes when I had spare time.
Viewed: 415 times.

Viewed: 421 times.

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.
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.
Viewed: 442 times.

Undercut around the hole to give the fiberglass resin something to hold onto.
Undercut around the hole to give the fiberglass resin something to hold onto.
Viewed: 437 times.

Viewed: 462 times.

Cutting out the 3 screw holes for the bilge pump mount to screw into solid resin.
Cutting out the 3 screw holes for the bilge pump mount to screw into solid resin.
Viewed: 412 times.

Ready to pour the fiberglass resin mixed with colloidal silica.
Ready to pour the fiberglass resin mixed with colloidal silica.
Viewed: 411 times.

Resin poured.
Resin poured.
Viewed: 436 times.

Test fitting to make sure the transponder fits onto the base without hitting the resin.
Test fitting to make sure the transponder fits onto the base without hitting the resin.
Viewed: 434 times.

Viewed: 397 times.

Filling all the holes with fiberglass resin.
Filling all the holes with fiberglass resin.
Viewed: 391 times.

Viewed: 398 times.

A whole buncha holes filled.
A whole buncha holes filled.
Viewed: 414 times.

Viewed: 428 times.

Viewed: 417 times.

Sanding the deck flat.
Sanding the deck flat.
Viewed: 405 times.

Ready to finish the fiberglass surrounding the mount.
Ready to finish the fiberglass surrounding the mount.
Viewed: 414 times.

Used an old piece of line to ensure the shape of the cutout is somewhat the same all the way around.
Used an old piece of line to ensure the shape of the cutout is somewhat the same all the way around.
Viewed: 418 times.

Fiberglassing over the line.
Fiberglassing over the line.
Viewed: 425 times.

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