a section of control surface which projects ahead of the pivot point

An arm fastened to a control surface to which is connected the control rod.

Control horns are used to give movable control surfaces movement. A push rod is used to connect a servo to a control horn (via a clevis or z-bend in a wire). The control horn is attached directly to the surface and can be made of nylon (best for combat sailplanes), or wood or metal. Store-bought control horns usually have several holes for connecting the push rod. Holes nearest to the control surface give the surface more movement.

This arm connects the control surface to the clevis and pushrod.

A lever firmly attached to a control surface and usually perpendicular to it that allows a pushrod or cable to move the surface.

A lever fixed to the control surface which connects with the pushrod or control cable.