Hi Ryan,
I saw your post the other day and thought I may be able to help
as I have a sort-of sacrificial ARCA vertical mirror which came with my car. The glass
is 'floppy' i.e. it gives the impression a cable has loosened or snapped.
Anyway, I went as far as I could without breaking anything (except ruining
the silvering on the glass), and found that the
cables terminate at the glass end where crimps are visible.
This is, as far as I can see, assembled to be a non-serviceable unit.
This of course doesn't mean it can't be. I've measured the cable size at 0.96mm,
so if a suitably sized crimp sleeve or clamp can be found, careful cutting of
the existing crimps is feasible.
I have good reason to try this as I'd like to investigate modifying LHD mirrors
to suit RHD cars. Your mentioned pivot point is where I need to be, but is
fairly inaccessible without releasing the 3 cables.
There appears to be space available to fit serviceable clamps, perhaps modified
electrical connectors.
The other factor is replacement convex glass, which I've not needed in the past.
I guess it can be cut to size. Anyone confirm?
Nigel