W12-01R and -01L Right and Left Hand Rear Spars. Drilled and updrilled holes for AN3-7A Bolts attaching W13-02R and W13-02L Root Rib Attach Angles. Fitted and drilled/updrilled holes for W13-03 Radius Blocks. W12-01L Left Hand Rear Spar - Cleaned and deburred all parts. Rivetted the left spar per the plans. Also installed the two AN3-7A Bolts.

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