impact adjustment

Recently a well-known guitar manufacturer released yet another version of one of their classic models, this time with circuitry and servo-motors installed that enable the instrument to tune itself. Since we are a warranty station it’s not surprising that several of these guitars have passed through the shop. Today one particular instrument has defied all of our careful ministrations, requiring us to call the engineers who designed and built it. One of them suggested hitting it with a hammer (though not in the precise location shown in the picture).