The Decades-Long Geometry of an Acoustic Guitar

Over decades of continuous string pull, the body of an acoustic guitar slowly distorts. The soundboard belly rises slightly behind the bridge, the upper bout above the soundhole compresses inward, and the neck angle tips forward toward the body.

When this happens, the string action becomes uncomfortably high. Lowering the saddle can only go so far until the saddle is shaved down flush with the bridge wood, eliminating string break angle and deadening volume. When saddle lowering is no longer viable, the guitar requires a neck reset.

The Dovetail Neck Reset Procedure

  1. Removing the 15th Fret: We carefully pull the fret over the neck joint and drill two tiny 1/16" access holes into the internal dovetail mortise pocket.
  2. Steam Injection: Using an espresso boiler steam needle, low-pressure steam softens the original animal hide glue in the joint while we apply gentle forward clamping pressure.
  3. Recutting the Heel Cheeks: With the neck removed, the luthier pares tiny slivers of wood from the heel cheeks using razor-sharp Japanese chisels to tilt the neck back into correct alignment.
  4. Re-gluing & Re-fretting: The dovetail is re-shimmed and glued back under correct geometry, restoring another 40 to 50 years of low action and full saddle height.