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Center the middle rail and secure using 1 5/8” screws. SEAT AND BACK TO ARBOR ASSEMBLY STEP 2 » Determine the height you prefer for the bench seat, usually from 16” to 18” above ground. » Deduct 4 3/4” from the height and mark that height on each “leg” of the arbor, this will locate the bottom of the seat support. » Drive nails in each of the arbor posts at the marked places. » Rest the seat on the projecting nails, line it up front and back with the arbor posts. » Hold the seat firmly t