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Then it was time to get up from underneath again to fit the number three and four pairs of formers.  So the bottom came off again and the whole unit was slide out over the edge of the table again.

The second picture below shows the former loosely in place.
      After both have been clecoed in place – including to the upper clip – they are then riveted. In the next two pictures the left side is done and the right is next.
          The clip has to be riveted as well and also the aft former is riveted.