Does the bottom of the fretboard extender get shaped to match the soundboard, or does the soundboard get shaped flat to match the bottom of the extender?
To facilitate the proper location and fit of the fretboard extender, we rout a flat region to accept the extender. With the extender in place in this recess, it is easy to identify where the 15th fret crosspiece goes. However, the leading edge of the soundboard should only be cut to accept the crosspiece after the headblock (with headblock cap in place) is glued into the rim assembly and measurements are taken. A: The leading edge of the soundboard should be flat where the fretboard extender goes. So, to answer the question, the flat bottom of the extender is glued to the flat outside surface of the soundboard. To help you get the extender in the right location, and to help prepare the flat surface in this region of the soundboard, we rout out the space where the extender goes. Then, you simply sand the neighboring areas of the soundboard down the the same level. On our A5 soundboards, the entire forward edge of the soundboard is machined flat at accept the base of the extender.
