This is the part of the program that sorts out the gimbals (sticks).
Stick Nut
This page sets the stick neutral positions. Each channel shows two values
The top value is the stick position with the centre offset applied. Ideally it reads zero when the stick is centred.
The bottom value is the the centre offset, and is quite probably not quite zero.
The values are for the two main gimbals, and also for the sliders on each side of the transmitter.
[ENT] returns to the service menu.
[CLR] clears the centre offsets.
[STO] stores the current stick and slider positions as their centre positons. It will then be necessary to to
[Stick Ga.]
Interestingly, it shows that the stick positions are probably quantized into about 900 discrete values.