I cut four long stringers and four short stringers, using a chop saw. I then started with the right spar and positioned a long stringer on the top flange and used the flange as a drill jig to drill the stringer. I used a 1/16" drill bit to ensure the stringer flange was above the spar flange. I then added the short stringer. Then I repeated with the other flange and two more stringers. Finally, I removed the stringers and marked them and finished by final-drilling the remaining #40 holes.
