The retainer for securing a musical instrument string to a body of a musical instrument includes a first casing portion defining a first opening and a ball-end chamber therein. The first opening is located at a proximal end of the retainer and a second casing portion is located at a distal end of the first casing portion. The second casing portion defines a passageway from the ball-end chamber to a second opening located at a distal end of the retainer. The passageway length is greater than the ball-end chamber length, and the ball-end chamber width is greater the passageway width.