"Bill" wrote

Thank you for your analysis. As no one is trying to keep it a secret, I'm
surprised the design is not more well-known.

After looking at it again, the break in the central axle is after the 3rd
member counting from the outsides. The 4th and 5th members are then on
their own axle that is one piece.

The back portion of the seat sliding forward against the front part of the
seat is also what keeps the "x" from spreading out too far when you sit on
it. Really clever.
--
Jim in NC


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