Abstract: The mechanism includes an assembly which fits in a notch in the bottom of the body of a guitar to carry the strings around the bottom in order to allow the guitar to be as short as feasible while having standard effective string lengths. This assembly includes features which allow independent adjustments for each string of the effective length of the string and distance of the string from its associated electronic pickup. The assembly is made up of a base and six roller assemblies. Each roller assembly carries a string around the bottom of the body. The base has two flanges with six set screws in each flange and each roller assembly rests on the ends of two set screws, one in each flange and is held in place by the string. One set screw adjusts the effective string length, the other the distance of the string from its pickup. The knobs for the tuning machines of the guitar are distributed around the top edge of the front face of the body of the guitar.