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4.6.5. For platform picketed guards, pre-assemble the top rail by inserting 5/16”-18 x 1” long
hex bolts through a 5/16” flat washers, the uppermost hole in the angle posts, and into
the 5/16”-18 round threaded inserts in the top rail.
4.6.6. Pre-assemble the platform picketed guard by inserting a 5/16”-18 x 1” long hex bolt
through a 5/16” flat washer (use flat washer for the upper rail only; do not use a washer
on the lowermost holes), the angle post, and into the 5/16”-18 square threaded inserts in
the picket panel (FIG. 4.10).