The Double Expanding Truss Rod
The double rod is installed directly under the fretboard in a straight trench approximately 3/8" deep. A long adjusting nut is used to focus the truss action away from the unmovable heel joint.
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
Drawbacks
Double the weight of vintage rod
More torque required for adjustment
More expensive to manufacture
Другими словами, в плоский гриф можешь не воткнуть по глубине, регулировать тяжеловато, зато на сгиб-разгиб работает (т.е., если натяжения струн недостаточно, чтобы "прогнуть" гриф - крутишь гайку против часовой стрелки и "гнешь" гриф анкером).
Stewmac - хорошие ребята, спокойно отзываются на все причуды.
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