I assembled the right tank, match drilled the j-stiffener and counter sank the holes for the tank baffle.
Slow going on these countersinks so as to not elongate the holes. They all go to a knife edge - the tank baffle acts as a backing guide for the countersink bit. Every 10th hole is left not counter sunk so the parts can be accurately clecoed together for final assembly and riveting. After the pro seal cures you go back and countersink and rivet the remaining holes.
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