On 03/16/2014 08:52 AM, micky wrote:
OT?

A lot of desk chairs and kitchen chairs have a center strut, that
compresses when one sits down.



snip


A few years ago my wife bought me a new chair for my office and of
course yelled at me for not looking at the assembly instructions.



Of course I put it together backwards and the seat, instead of leaning
back, leaned forward. She really had a good laugh.

I told her that if a good engineer designed it, the holes would only
line up in one way, making a reversed assembly impossible.

Anyway,,,the need for a strut should be intuitively obvious.