Layed out and drilled up #30 pilot holes in 8 butt rib brackets. 4 holes in each bracket. Pivoted wing back and slid but ribs into place. Then adjusted butt rib position using shims and masking tape. leaving 1/16" gap to make up for fabric installation. Drilled up hole locations and marked brackets for reinstallation. Disassembled all parts and deburred holes.
