Sun Shades for My Pergola.

The first screw eye is 1 in. from the end of the header, the second screw eye is 12 in. from the first one, and the third screw eye is positioned 18 in. from the second screw eye. To secure the shades in the middle of the pergola, I drilled 5/32-in.-dia. pilot holes into the inside ends of the dowels and then twisted in 1-in.-dia. screw eyes. Next, I drilled 3/8 -in.-dia. holes into the deck directly below the screw eyes, and then tapped in ¼-20 threaded metal inserts. [Extracted from the article]