May I offer a little good natured input about this trim business.....
"Dave?"
"Yes HAL."
"Are you holding the trim wheel Dave?"
"Why do you ask HAL?"
"Just 'checking' Dave."
"Why HAL?"
"Ah yes I feel it now, you have a very gentle touch Dave."
"Thank you HAL."
"I would ask you to please let go of the trim wheel Dave."
"I can't do that HAL."
"I certainly don't want to have do this Dave, but if you continue to hold that wheel I will CUT OFF your Prims, one Prim at a time."
THS movement does not necessarily require an SS movement, NOR will an SS movement necessarily command THS movement!
"Dave...Dave...what are you doing?"