Perhaps this can be simplified as a discussion of Component Vectors
V-> = (Vx, Vy)
![Image](https://www.varsitytutors.com/assets/vt-hotmath-legacy/hotmath_help/topics/components-of-a-vector/image003.gif)
The wrap-around(-the-heel) cable has to be under tension or it would fall off.
The heel-pivot is higher than it's connection to the frame.
Hence there is a downward component vector resisting the raising of the heel,
which becomes larger as the heel is raised.
![Image](https://i.imgur.com/1RaXhYO.png)
![Image](https://i.imgur.com/1KlqJmU.png)
![Image](https://i.imgur.com/TF7RCtA.png)
How to affect how much the heel is "anchored" or "locked" versus "free" seems well-established.
The component vectors should be easy to visualize, as well as how the following system functions.
Source: http://www.smhc.co.uk/objects_item.asp?item_id=33040 (<-- short read)
![Image](https://i.imgur.com/E4ufbUR.png)
![Image](https://i.imgur.com/hYyCRYt.png)
If you've read this far and would like more of a rabbithole, check this out. It's in German, but even scrolling through the photos gives an idea of this paper's scope.
https://docplayer.org/18680858-Alpiner- ... en-at.html