In article ,
says...
Thomas Borchert writes:

If you fly a cruise speed of 150
knots in a Baron, you'd still have different elevator positions
depending on CG location. In fact, the position would change during the
flight with fuel burn. Which would be "neutral"?

The one that aligns the trim tabs with the control surfaces.

What if it's a spring type system, rather than a trim tab - what is the
neutral position for that?

--
Duncan