After the top panel is on, you should have some steel pole sticking up.
Now slide the short plastic pipes over the steel poles and then screw a bolt and washer down into the threaded insert in each of the 6 poles.
be careful not to overtighten. It may be necessary to tighten the bolts a little after a few days as the system compresses a little.
These bolts add a great deal of strengh and rigidity to the rack.
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