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Pop rivet heads that just fell off during removal.
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For some rivets, I had to drill down and then pull out the remains of the rivet. This balsa seems okay even though the adjacent test hole was discolored.
When pulling the rivets, there is no way to avoid some damage to upper laminate, but that won't matter because this will be drilled out and filled with epoxy.
Pulling corroded rivets out of the core after the heads had been drilled off (or the heads had already fallen off). Here is another picture showing that the bead of caulking could hold dirty water behind the panels and contribute to the leaking pop rivets.
Pop rivet heads that just fell off during removal.
This shows the flotation foam behind the starboard panel. I intend to reuse most of it, but fastened into place with spray foam. When loose, they act as wedges against the panels and may have contributed to the pop rivet failures.
CD 16 seat box/cockpit panels removed.
Seat box removal, showing the exploratory drilling on the port side that made me decide to remove everything. The dark holes indicate bad balsa core. The outer holes are marked "OK" with a red marker, although I may find that's a bit hopeful when I go further.
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Pop rivet heads that just fell off during removal.

Pop rivet heads that just fell off during removal.
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Balsa Core Issues
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On the original setup, the fuel filter was between the tanks and screwed to the deck. It's now hung temporarily from an outboard bolt (above the bilge pump) and exploratory holes have been drilled to find out the condition of the balsa core where it has been breached to install hold-downs for the various gear.
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Marco Flamingo
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