Stringed Musical instruments; guitars, guitar parts, namely, nuts, tuners, nut locks, string locks, saddles, bridges, and tremolo apparatus in the nature of tremolo locks, tremolo base plates, tremolo arms, tremolo intonation tools comprised of a screw and a correspondingly grooved hollow cylinder for adjusting guitar intonation, tremolo saddles, tremolo studs, tremolo blocks, tremolo springs, tremolo claws, tremolo stops