I did the same dictionary search too... to my mind the words are too similar to have any significant distinction. The problem with language is that its useage and meaning evolve with time. Whilst Homer may have had a subtle distinction in mind at the time of writing ( he was middle-aged and it was late 60s)... there is no real distinction in the words now.
If I can discern his intent then it seems that the essentials provide the scaffold/structure which make a hands controlled pivot possible and the fruit of that pattern are the imperatives.
I just do not think that a true hands controlled pivot can exist without a stationary post... it is mandatory or "essential" to make the concept work.
The imperatives can be attained with a pivot controlling hands pattern....
just thinking out loud... interested in your thoughts
The other piece of language that seems odd to me is the use of the word "vertical"... it may be an "English english" versus a "US english" thing... but common usage of vertical is to describe a plane at 90 degrees to the horizontal plane... Homer uses it as I would use the word "perpendicular"... ie. 90 degrees to any plane
I prefer to hear the word "perpendicular" rather than "vertical" especially when describing hinge action because the word " vertical " is already used for a hinge action... anybody agree... language update for the 8th edition?
and yes i do know how "dangerous" it can be to alter the language even when the message is the same... or even clearer!
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