When I shift it into 7 or 8 position I can no longer access the little socket that holds the head of the cable.
However. I advanced it as far as I could, threaded the cable end through, wiggled it a bit and it went through. It was a bit tricky getting the end through opening where the adjuster
threads, but it worked.
You sir, are a genius. Much thanks.

I have three of these types of shifter, and this was definitely the trickiest.