What the repair actually involves
Sound and mark: each unit is flipped and struck with the flat of a hand near each stringer. Solid rings, cracked thuds. Then it is chalk-marked for companion, deck replacement, re-nail or core.
Cut and fit from kiln-dried salvaged stock matched for thickness and species, fastened with helical nails through both decks. Back onto the squaring jig, checked corner to corner with a steel square to a quarter-inch tolerance — about one in twelve fails and is reworked on the spot. Then a fresh Passport ID is burned in with the repair count incremented.
