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5.9.7. Adjust the Top Rail Standoff to contact the underside of the elbow, then use the
holes in the standoff as a template to drill 5/16” or 11/32” holes through the 2” x 2”
angle posts (FIG. 5.39).
5.9.8. Attach the Top Rail Standoff to the 2” X 2” angle posts using 5/16”-18 x 1” long
button head socket cap screws, 5/16”-18 nylon insert locknuts, and 5/16” flat
washers (FIG. 5.39).
5.9.9. Drive a 1/4”-14 x 1-1/2” self-drilling, self-tapping screw up through the underside of
the Top Rail Standoff into the 1-1/2” diameter, 90° elbow. Put pressure on the elbow
until the threads engage and pull the components together (FIG. 5.40).
5.9.10. Tighten all fasteners securely, including all ring joiner set screws and elbow assembly
screws, if not completed previously.