replacing masthead wire

[hughman]

Greetings fair leaders!
I'm trying to replace mast wiring in a 50+ YO spruce Cheoy Lee mast.
there are 3 single heavy gauge wires that won't budge. Can someone enlighten me as to how these wires are installed? I'm hoping there aren't interior clips/staples/fasteners to secure them- maybe someone who has had to rebuild one of these masts can post their experience.
Many thanks!