I don't know what was being "repaired",
but I've taken a precaution against sharp
bending of a cable (lamp cord, e.g.) by whipping
it with something, and I think once by essentially
seizing onto it some plastic from a milk carton,
for added bending resistance. And the size of
the whipping cord should be smaller than what
you show, IMO.
Cheers,
--dl*
====