Mike, you do good work. That is the wrench exactly.
I would say my ferrule is 1 1/8"
Changing systems, I would say that the end cap is 1 cm. and has a split nut. I wonder if it is left handed like so many are--but I will not disturb it.
Mine does not have the feature with the adjustment lock described in the patent. Don't ever remember seeing it.
BTW, do you have any idea why some are left-handed?
And is this the origin of the left-handed monkey wrench?