> > Thanks.  Just curious why they used all the wingnuts
 
> Perhaps so it can be readily folded up for shipping?

It does collapse quite easily and has been stored in a tube. Rivets
would not have been a good choice for this design because the
cross members have plates with slight indentations that align them
to the square-profile centre beam. From memory this particular
one was at the upper end of the price range (because of reception
difficulties) and therefore I probably paid for the convenience of
wing nuts rather than hex nuts

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