The E string on an electric bass guitar has a length of 0.775m and, when producing the E note, vibrates at a fundamental frequency of 41.2 Hz. Players sometimes add to their instruments a device called a "D-tuner". This device allows the E string to be used to produce the note , which has a fundamental frequency of 36.7Hz. The -tuner works by extensing the length of the string, keeping all other factors the same. By how much does a D-tuner extend the length of the E string?