HS 404 and 405 Continued - marking the rivet hole locations

SO these are the marks for the rivet holes that ensure that they have enough edge distance. 4 holes are required for the main rib flange, while only two are required for the flange on the nose rib. The whole point of the exercise of clamping the two rib sections together was to determine where the edges of the flange of the nose rib will line up with the flange on the main rib as shown in this pic. It is otherwise difficult to figure out where these holes go since the front spar fits in between the two ribs.

The vertical lines represent the edges of the trimmed flange of the nose rib and where it will be positioned in relationship to the main rib once positioned on the other side of the front spar. This allowed me to "transfer" the position of the shorter flange of the nose rib onto the larger flange of the main rib so that I can better determine where the center rivet holes needed to be drilled to maintain proper edge distance. Van's wants everyone to locate these holes themselves, so they do not pre-drill any of the holes in either flange.

This was a major pain in the ass to figure out, but I am confident that all the holes are now properly marked. Basically the marks all represent rivet hole locations that 1/4 inch away from all edges of each flange in each rib. The distance needs to be 2x the diameter of the rivet used. IN this case, they are 1/8 inch thick rivets, so 2x 1/8 inch is 1/4 inch to meet minimum edge distance.