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5.3.12. Insert 5/16”-18 square threaded inserts into both ends of the midrail. Use a rubber mallet
or similar tool to fully seat the threaded inserts as needed (FIG. 5.8).
5.3.13. Install 5/16″-18 x 1″ hex bolts through a 5/16” flat washers, the long leg of the closure
bracket, and the 2” x 2” angle post into the 5/16”-18 square threaded inserts installed in
the midrail. Use the hole approximately in the middle of the 2” x 2” angle post as shown
(FIG. 5.8).
5.3.14. Tighten all fasteners securely.