Deburr and primer all center ribs 6-W-6-1 to 9, and angles 6-W-6-50 to 54. Brackets 6-W-6-10, 11 and tiedown ring 6-W-9-1. Some angles (eg 6-W-6-51) were drilled 3,2 mm, but corresponding holes in spar was 4mm. Drilled them to 4 mm. After sanding and cleaning I start rivet all angles to spars. Some 3,2 mm and some 4mm. For bellcrank support extra long 4 mm rivets were used. Drilled holes for fuelpipe, 18 mm, in rib 1 to 5.
