How to set curve point that will determine the extrusion line

 From:  DannyT (DANTAS)
6327.13 In reply to 6327.12 
Hi Michael,

Is the seam in all NURB surfaces? not only in MoI I'm talking in general, it's only when discovering MoI I've come across the seam all other CAD packages don't show a seam I'm assuming it's there, only not shown, is this correct?

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~Danny~