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/snip/I found Berg's video clip helpful. I tried with a pair of cords, and even a single cord held firmly from rotating.
There is a patent device based on this that is described in an AJP
article: Some mechanisms related to Dirac’s strings Edgar Rieflin Citation:
American Journal of Physics 47, 379 (1979)
And Dick Berg has a good page about the Dirac Rope Trick here: