Install and match string pluck richness.

** Our first acoustical bridge adjustment, with the violin strung up, is to pluck across the four strings, one at a time, listening for the richness of tone that is sometimes produced...
>> Do all the strings porduce rich full sound, or some better than the others.
..We are hoping at at least one of the strings will sound extra rich. If so, that string will serve as our reference to adjust the others. Based on what we find out : We can do these adjustments with the bridge in place...

>>> This box is for the situation that only one of the strings has a full and rich plucked sound:

This string will be our standard and is not adjusted further. It will be the tap tone : 'next to its top of bridge string contact' which we will raise of lower the other three strings to.
Tap the top of the bridge next to the other strings and compare to this 'reference string'.

>>> First is a string has a Lower tap tone compared to 'good' string :

This means that some points on the front surface (toward the fingerboard) of the Bridge, Below this string are Too High in surface tap tone; compared to the Tap Tone of the surface below the 'good' string.
Note these too high areas in your mind and then with a fine jewelers file (or sanding stick , or sand paper) remove slight amounts of the bridge face until it matches the 213 HZ goal for the face of the bridge.
Once all these areas are adjusted, do the across the strings plucking test to see if there are now two good strings... Repeat as necessary.

.Do these steps in small incriments as we do not want to lower if below the 213 HZ target.
{We can raise it back up, but we would rather not have to do it!}

..Listen to the : " Downward from the top Tap Tones" on both sides of the string contact position. To hear how much too high these tap tones are compared to our Good (reference) strings' situation tap tone...
>>To correct, carefully file these too high tap tone areas with a very fine jewelers file to bring down the tap tones to the correct (242 HZ) tap tone. Only Tiny amounts will be required!!!
{Best to have a file where one edge is ground perfectly smooth, and use that side against the string, to prevent string damage from the filing step...}
>>Please note : the tap tone may be different, one side of the string to the other, so be prepared to adjust each side of the string as needed...

..When this step is completed, all four strings should have the same desired rich sound when plucked sideways...
*..On the next Page of instructions; we will advance to adjusting the Timbre of each string to our pleasure and to match each other. using the techniques developed by : retired physicist : Lars Silen, who graciously dedicated several years to his research and then shared it with us!