Have not lived until having part of yor knee removed by that thing.
hope the flaps were up. damn thing flies around with flaps not up.
why so big? leverage.
it would be hard work doing it manually without that circumference.
plenty of turns though!
and yes a big splined shaft joins the 2 wheels its a chain drive to a cable drum.
That I suggest is as close as you want to get.Bugger of a place to work.
for one of the other posters, remembering the ng has the one trim motor not two like the classics.