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5.8.4. For the turn back top rail, first measure the distance between the 1-1/2” square x
42-5/8” long closure posts at the turn back, then cut the 1-1/2” diameter tube to
the measured length, less 1/8” to account for the threaded inserts, which will be
installed in the following steps.
5.8.5. Using a metal file, smooth all sharp edges from cutting the 1-1/2” diameter tube.
5.8.6. Insert 1-1/2” round threaded inserts into both ends of the 1-1/2” diameter tube.
Use a rubber mallet or similar tool to fully seat the inserts if needed (FIG. 5.31).
5.8.7. Attach the top rail between the 1-1/2” square x 42-5/8” long closure posts using a
5/16″-18 x 2-1/4″ long hex bolt through a 5/16” flat washer, the uppermost hole in
the closure post, and into the 5/16”-18 round threaded insert (FIG. 5.32). Repeat
this process for the opposite side.
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