Dual Action Truss Rod 20"    

Doeringer Guitars, makers of top quality handmade custom guitars, basses and pickups and reseller of quality parts.      Art - Tone - Playability

Our Dual Action neck adjustment system features an active rod and a flat passive rod in brass collars. The steel active rod turns for smooth neck alignment, with 2-way action. The Dual Action Rod requires an access cavity for the adjustment nut, and a straight 1/4"-wide x 3/8"-deep slot (measured from the bottom of the fretboard) for installation. The 20" rod fits most 24 fret electric guitars, baritones and short scale basses.

When flexed in the neck, resulting pressures are shown above. The blue arrows show the two rod ends exerting high downward forces while the middle pushes up uniformly. The resulting neck movement shown with the yellow arrow, determines string action height and corresponding relief.

The force exerted by the tail end of the double rod is considerable. There must be a minimum 1/8" of wood below the rod end to prevent wood failure in this area. This becomes a concern only when thinning a neck beyond factory engineered dimensions.

Benefits of the double expanding truss rod

• Extremely stable, no seasonal adjustments are necessary

• Increased mass = longer sustain, cleaner and clearer notes

• No end to end wood compression to eventually distort the neck

• Top adjusting on 13° Angled necks (or similar)
  

 Easy to install. The Hot Rod fits in a straight channel. For proper operation, this truss rod must be installed so that the active rod (the round rod with the adjustment nut) is below the passive rod. A wooden filler stick is not required.