drive finger

drive fin·ger

(drīv fing'gĕr)
Finger used to turn the instrument handle while holding the instrument in a modified pen grasp. Either the index finger or the thumb turns the instrument. The digit used to roll the handle determines the direction in which the working-end will turn.
References in periodicals archive ?
In contrast to these muted piano tones, Bela Bartok's Allegro Barbaro seems to encourage the pianist to drive fingers quickly and deeply into the keys to obtain the sforzando dynamic indicated by Bartok for the first chord of this fast and furious piece.