How to Build an Arbor Bench

Cut a 30-degree miter off one end of a reinforcement block, per the cut list. Attach it to the seat base's middle stringer, long edge facing upward, using 2⅝-inch screws. Slide the backrest's center support into the gap between the reinforcement block and the back of the seat base, as shown, until the bottom is flush with the underside of the middle stringer. Secure it by driving 2⅝-inch screws through the support and into the stringer.