How do I fix this tray table?

I’m trying to fix these old tv tray tables for my mother, but this is all I have. Im not sure how they work or what they’re missing. I have two of the exact same. Any help is much appreciated!

Kara
q how do i fix this tray table
q how do i fix this tray table
q how do i fix this tray table
  3 answers
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