uspending the neck on pivots allows the strings to position the neck. A string under tension defines a straight line. Since the strings are straight, so is the neck.
The neck, bridge and pickups are a floating unit suspended from the headstock and body by pivoting joints. String tension is conveyed from the headstock to the body by a lightweight, hollow aluminum tube. This tube does not have to be heavy or tremendously rigid, because it is designed to bend as it takes up the string tension.
In a conventional guitar, rigidity of the neck is assumed to be the solution to neck warping. The design of the F4 realizes that some deflection is unavoidable, and so makes sure that the neck is isolated from the warping forces. Pivoting joints between the neck unit and the headstock and body prevent the headstock tube’s deflection from affecting the neck.