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As each area is scraped/sanded the tap tone is constantly checked against areas which are already at the determined 'goal' frequency.

A wood scraper and sandpaper of various grades on a foam sanding block are the tools I use to gradually bring the tap tones into alignment.

This photo shows the small total amount of wood sawdust and shavings removed to completely acoustically tune this violin

Next, a piece of pure linen cloth is wrapped around the foam pad and the fingerboard is briskly polished. This is followed by polishing with a pure silk cloth in similar manner.

Here we see the fingerboard, polished, tuned and ready for the violin to be re-strung and further tested. This process is repeated until the desired result is achieved.

( Copyright 2004 (c) by David Langsather)