A tension arm (12) has screws (11) within a guide to regulate the tension of the string. The bridge (15) involved is blocked by screws (3) and is connected by bolts (2) with a block (14). By this linked connection, the block can be raised or lowered, so that a string regulation occurs. The raising and lowering are effected by a screw (8). The block (14) has a connection with the screw, and at the end of the screw is a ball, which is embedded in a guide, being able to be pushed to the right and to the left, with the ball maintained in the guide. USE/ADVANTAGE - To tune the strings of a musical instrument.
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