Drilled the other holes in the R/H and L/H rear channel strut brackets to a #10 except for the three holes that will have bolts. Drilled all the holes in the L/H wing rear spar pieces to a #21 and #10 for solid rivets. I left the holes that mount to the ribs at a 5/32". Deburred the holes in the strut brackets, L/H wing slat brackets, nose ribs that the slat brackets attach to, the 4 L angles that attach to the outboard spar extension.