I located the holes that attach the HS-708 rib to the rear spar assembly with a large pop rivet. The instructions say to enlarge the holes to a #21 drill bit, but I found that a #21 hole gives too much play with the pop rivet. I used a #23 drill bit which is the smallest hole the pop rivet can fit into. I will enlarge the hole if needed in assembly with the ribs. The holes with the big "t" marks are the enlarged holes. I counted about seven times to make sure they were the right holes.
I also match drilled the HS-412PP and HS-413PP hinge brackets and marked all the parts and their orientaition.
