John,
This is great. Thx for sharing.
I like your informative page. And the reference list is good, in particular
the first reference: Ethan D. Bolker, “The Spinor Spanner”. Am. Math. Mon.
80, 977 (Nov. 1973)
I was CS student at UMass Boston early '80s and Ethan Bolker was an
influential teacher there, very popular with the CS students.
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: https://physicslearning2.colorado.edu/QOTWSite/services/demos/demosp2/p2-61.htm