Abstract: A stringed instrument includes a bridge having drums over which strings pass that are equipped with locking members to prevent unwanted string vibrations and shifts in a string's octave point that normally result from the loosening of the harmonic and height adjustment screws of the drums.

Abstract: A kit for converting a single-stringed instrument to a double-stringed instrument including a unique combined bridge/tuning mechanism (50) which replaces the bridge assembly of the single-stringed instrument. The combined bridge/tuning mechanism (50) includes a bridge assembly over which both the original strings (20) and the additional strings (40) pass, and an integrally mounted tuning assembly (54) for adjusting the tension in (i.e., tuning) the additional strings. The bridge/tuning mechanism (50) includes a base or mounting plate (60) from one end of which perpendicularly extends a flange (62). The tuning keys (86) which comprise the tuning assembly (54) are pivotally mounted to the upper end of the flange (62), the additional strings (40) passing through apertures (68) formed in the flange (62). The flange (62) also serves as a means for terminating one end of the original strings (20) whose other ends are terminated in other tuning keys (18) located, for example, on the head (16) of the instrument.