I completed drilling the 3/16 inch hole through each of the wing attach points using the 3/16 hole in the attach blocks as adrill bushing. I had not up drilled the spar web earlier. After up drilling the attach points I married the spars for the first time. All of the holes lined up very well. I up drilled the three remaining holes to #30 then to #21. Finally I up drilled the center hole to 3/16 of an inch. I decide to take things apart at this point to check things out. All looked good so I decided to up drill the remaining two holes to 3/16.
Dave's Sonex Builders Log 
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