Gently swivel the thin arch casing from the deep arch casing. This reveals two pairs of screws holding a cable retaining bracket in place at the base of the deep arch segment:

2x ??? JIS (probably #000) screws

2x ??? JIS (probably #000) screws

I did not keep track of how big the bits that I used to unscrew them were, sorry!

Unscrew the screws and remove the retaining bracket. Don't remove the cable yet.