A string attachment system for securing a string to a stringed musical instrument. The string attachment system includes a bridge pin having an elongate stem defining an outer surface formed for longitudinal mating insertion into a pin hole defined by the walls of a walled opening through a bridge assembly disposed on the body of an instrument. A passage is formed to extend transversely through the stem from a front entry point to a rear exit point. With this arrangement, the bridge pin can receive an end of a musical string through the front entry point, through the passage, and out through the rear exit point to enable the string to pass through the bridge pin and into the pin hole along with the stem of the bridge pin. A rear groove is formed in the outer surface by two planar walls intersecting to form a v-shaped groove for receiving the string.