Alternatively I tried to replace the potentiometer with the one attached.
It has the hole for the shaft that I will try to redo.
It has the right size, but the value is different, 10K.
This is actually an endless potentiometer, i.e. continuously rotating without STOP.
I could make a change to the servo motor limit switches and be able to make it work.
The problem as always is my google search ability.
I can't find a store that has it available.