Truss rods are installed in the necks of the Mosaic and Mosaic Pro to facilitate the correction of neck relief (overbow or underbow) caused by string tension and/or changes in temperature and humidity. The amount of relief in either direction directly affects the instrument’s string height and playability.
This model has one dual-action truss rod, which allows the neck to be adjusted in either direction. Therefore, it is possible to compensate for underbow or overbow.
Making adjustments. Remove the cover plate behind the string nut on your instrument. Using the 4mm hex wrench supplied with your instrument, turn the adjusting nut clockwise to decrease the amount of relief and straighten the neck, or counterclockwise to increase the amount of relief, giving the neck underbow.