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Summary "How could you model a coil spring with these criteria?"
Pro Gurus:
Thank you all for your valuable input.
The engineer draft specifies that the wire is not square but round and without flat ends. It's a torsion spring by the way.
I re-discuss the matter with the engineer and he agree that he was miscalculated and give me the wrong overall height value. Which should be .1125 instead of .100.