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Through experimentation, I have found that for this model of violin, the post should be an accurate 0.125" behind the back side of the bridge. (This is typical for most violins)
The pictured tool is made of two layers of thin plastic stapled together. A notch is then cut out which locates the sound post. One piece is inserted inside through the 'ff' hole and the external piece shows the exact location of the sound post. An ordinary business card cut 2/3 through works to locate the front side of the post.
Here then is the completed violin, ready to play for the first time.
At this point, I have yet to put bow to strings.
The chin rest is easily attached with the two bottle screws; so If a different style chin rest is needed it is easily switched.