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3.
Repeat steps 1 and 2 for the remaining three lower headers.
Your pergola should appear as shown, below, now.
4.
Identify the 5/16” wing-end holes in the face of the lower U-channels. There are 2 such faces in each quad header
bracket.
Drill 3/32” x 1-1/4” pilot holes in the center of the 5/16” holes.