In my previous post you can read all about the Lower String Extender I made for the classical guitar. Now, people ask how they can find the position of the new partial nut and the new -1 fret.

Of course, one could measure the distance from the tenth fret to the saddle before the the string is extended. This will equal the distance from the new partial nut to the old tenth fret, which would be the new twelfth fret after extension.

To do this with math, use the calculator below. Input the s = scale length of the string before extension and a negative n = fret number (-1 and -2). Press CALCULATE and read the d = distance from the existing nut to the new -1 fret or partial -2 nut. Inches or millimeters can both be used.

All other fret positions can also be calculated with this applet, but this goes beyond the scope of this post.

d = distance from nut;
s = scale length;
n = fret number;

After installation of the extender, check the octave on the twelfth fret (the old tenth one) with a digital tuner. Now play your upgraded guitar with a new ringing sound!

This post is dedicated to the great luthier Nikos Mastorakis from Ierapetra, who is building a new extender on my Washburn 308s Parlor Guitar. Pictures, videos and sound recordings are soon to come!