Installation and tuning of strings on a musical instrument is aided by an accessory having a socket which fits onto the heads of the string engaging pegs of the instrument. A lever extends sidewardly from the socket and an elongated handle extends from the lever at right angles to the lever. The lever and handle jointly form a crank which facilitates turning of the pegs to tension or loosen strings. The accessory includes a cutter for cutting the strings. In the preferred form, the handle has a first portion which is directly attached to the lever and a second portion which is pivotable between a first orientation at which it extends in parallel relationship with the first portion and a second orientation at which it is angled relative to the first portion. Inserts on each of the handle portions have sharp cutting edges located to be in sliding contact with each other as the second handle portion is pivoted towards the first orientation.
