Bill :
The horn on the wing is as close to the surface as I could get it and close to the trailing edge of the wing as I could get it. With the deflection of the aileron shown, you can see the deflection of the trim tab is a little lower than the airflow of the wing and maintains that deflection all the way to full aileron travel. The horn pushrod on the trim tab is right over the hinge line as you would do on the elevator or ail horn. When the ail. is at the neutral point. the trim tab is too, although that goes without saying.