In tree, while waiting for ground control to recover.......
On small upright 'saplings' in tree and later on the ground
Can face with chain or handsaw and back cut with handsaw.
Get lots of close visuals on Dutchman pushes and tapered pulls at different angles of 'lean' imposed by hand pull or push, changing that angle etc. Even pull/push face back open and re-work face etc. Things to same scenario could never get 2nd comparison check from at full scale.
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But even this small HO scale model has same principles to show. Like bypassing cuts, different angles of pull on one sided ballasts of Tapered Hinge or Step Dutchman, pulling into or away from cross axis of the adjustment. But, even more, can FEEL , build a feel for what is going on, that for me flowed into felling and rigging. But, was already pre-set to read thru body from gymnastics etc. If can feel bypass seize from horizontal bypass, becomes lot less arguable that there is no effect...