Trivial Rail Revolve?

 From:  Frenchy Pilou (PILOU) 6 May 2007  (1 of 4) 
598.1 
Does the Result of the Rail Revolve normal?
Why the first circle is repositioned?
Axis is vertical, circle also (3dm linked)
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Pilou
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EDITED: 6 May 2007 by PILOU
Attachments:
Attachmentrail03.jpg
Attachmentrov.3dm