the tremolo device can be used in stringed musical instruments , and more particularly in electric guitars . it provides a simplified construction allowing easier usage and improved sustain , wherein , in the front portion of the rear string saddle an opening is formed , which axis is nonparallel to and does not intersect the saddle assembly shaft axis and also does not intersect the string axis . in the opening the fine tuning spring is disposed , reaching the opening bottom with one end and with the other — the back wall of the front string saddle .