Instructables

Step 28: Drill pilot holes, countersink, then attach the rear back support.

Picture of Drill pilot holes, countersink, then attach the rear back support.
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Don't forget the glue.  Make sure that the back support is evenly spaced (about 21") from both the top of the front leg and the bottom.

I've seen similar designs that incorporate a carriage bolt, washer, and a nut here, instead of two screws.  Definitely a stronger way to go!
 
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