Double Action Truss Rod Adjustment

The double action (dual-function) system permits accurate adjustments to the neck in both directions.

1. Truss rod in 'flat' (no tension) position

2. Tightening the truss rod clockwise causes the neck to become increasingly convex (over) = less relief

3. Tightening the truss rod counter-clockwise causes the neck to become concave (under) = more relief