Abstract: Tremolo apparatus for a stringed instrument, provided with a baseblock (103) for anchoring strings (108), a first knife edge bearing (106/131; 166/153) defining a first pivot point, and a second knife edge bearing (107/130; 165/152) defining a second pivot point. The first and second pivot points define together a pivot axis (X) for the baseblock (103). The baseblock (103) is provided with a series of string guide elements. A first outer string guide element (104) is located a first predetermined distance away from the first pivot point, and a second string guide element (104) is located a second predetermined distance away from the second pivot point. The first and second knife edge bearings are arranged in such a way that the first distance and the second distance are adjustable independently from one another.

Abstract: A locking apparatus (1) for a string of a stringed instrument, which locking apparatus includes a locking cam (20, 23-27) arranged rotatably about a point of rotation and a locking wall, which locking cam and locking wall are positioned relative to each other in such a way that a string can be locked between them. The rotatably arranged cam is an eccentric made from a hard and stiff material, placed in a U-shaped channel of a hard and stiff beam (3). This channel contains the locking wall. A small spring holds the locking cam to the locking wall in case no string is present between the locking wall and the locking cam. The eccentric is shaped in such a way that the locking cam and the locking wall contact at only one point, in case there is no string between them.