Python Disentangement

hey.

i'm trying to find a puzzle called the python. it's kind of a chain of
horseshoe shaped rings...maybe 11 rings. at each link, there's a ring.
i believe the point is to remove all the rings.

i found a pic of it here:
http://www.baxterweb.com/ipp17/images/puzzles/swift.jpg

if anyone has any info, or knows where i can find it, that would be
great.
thanks