My turn to be embarrassed ...
I admit that it was your theory in the first place!
The core of my explanation was indeed completely derived from the completely clear and unambiguous video you provided and (as far as necessary) commented upon in the first place.
I would never have taken up the pen, if not for at least trying to counter the later and quite deviating explanation that I reacted to.
Last edited by Plumb Bob; 11th Oct 2018 at 08:38.
Reason: Embarrassment was on my side ...