..These are articles and Instructional videos about acoustically adjusting the Ribs of the Violin:
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...Just a few words might be useful here. As I came to the conclusion phase of the Tap Tone Project, the tuned plate frequencie of 198 HZ back plate, can then be used as a comparison tap reference.
..This tap is applied to the ribs from the side (either inside or outside and 90 degrees to the surface. Compare to the wood reference tap tone scale tool. Adjust the areas that are above 198 by sanding or scraping the surface in region that is too high until it becomes the 198 Hz goal frequency. Leave the too low area alone. Material can be removed from either inside or outside of the ribs to the same effect. A (1) mm thick rib (0.0394") should be close to the goal frequency automatically.