Making a shade house from a rotary clothesline

I have a large rotary clothesline that I wish to turn into a shade house with the help of 4 long pieces of galvanised pipe ,[ to anchor the corners,] and shade cloth . However I can't work out how to attach the corners of the rotary top to the holes in the corner of the galvy . I will have to pay one of the neighbors to give a bit of a hand , as I'm an aging duck and will need help . What are the heavy weight metal rings that screw up?
Thanks . Hope someone can help.
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