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Thank you for your good idea. It seems that I need a 3D software tool for making a pentagram knot.
Have you tried making it with paper?
As far as your circle, I assume the sizes of the circles are critical. A little different, and you might end up with more sides on your star.
Cute...Did I say pentagram earlier when I meant pentagon?Anyway...Have you looked at the Rotary (Wankel) Engine?
Anyone need to drill an (almost) square hole ? ... http://www.youtube.com/watch?v=L5AzbDJ7KYI