A stringed musical instrument is disclosed for preferentially adjusting sound harmonics. The stringed musical instrument includes a body having a soundboard with a soundhole formed through the soundboard, a bridge, including a string support saddle mounted thereon, for supporting a plurality of instrument strings, a vertical member disposed within the body attached to the bridge through apertures in the soundboard, wherein the vertical member is further attached to an flexible member configured to affect rotation of the bridge, and a safety stop component disposed with in the body and configured to restrict movement of the vertical member. The soundboard is attached to the body via a side binding and unattached to internal support members within the body.