Trued-up skeleton: Measured, re-measured, clamped and checked against skin holes. (Very time-consuming.) Primed HS-607 and HS-404 ribs. Clamped, clecoed, drilled and riveted HS-607 and HS-404 ribs to forward spar. Use angle-drill attachment for the first time. Used offset rivet shaft to drive rivets in the HS-607 -- shop heads turned out OK, but appeared slightly undersized. The left HS-607 rib initially appeared to be misaligned with the rest of the rib (~1/16”), but it aligned with the skin holes OK. Filed a little off the flange of the right HS-404 rib to clear HS-814 angle. Re-primed.
