Tutorial : How to model spring with square tube shape

If you are boring to spring with cylindrical shape, let's try a spring with tube shape.
See : http://www.youtube.com/watch?v=4VJ1_8kQOoI&feature=youtu.be
If you are boring to spring with cylindrical shape, let's try a spring with tube shape.
See : http://www.youtube.com/watch?v=4VJ1_8kQOoI&feature=youtu.be
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