With all the skins in place I checked to make sure there was no twist in the fuselage by hanging a plumb bob on bulkheads on each end. The tooling holes are on center, so if the plumb line fell past the center of the top and bottom holes, on both bulkheads, the fuselage would be straight. I double-checked this before I drilled. I double-checked the J channels for proper position and drilled them to the skins. It worked best to drill every fourth or fifth hole and then cleco. I worked from one end to the other. When the J-channel was located, I drilled the remaining holes.
Time: 2 hours.
Leonard's RV-7A Build 