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Wippen. A rocking lever that transmits the motion of the key to the hammer.

Wrest pin. A 7mm-diameter steel pin around which the string is wound. By turning the wrest pin, the string's tension can be altered and therefore its tuning. A small hole is drilled through the top of the pin to anchor the string and a fine thread is wound around its base so that it can be extracted from the wrest plank.

Wrest plank. A tough laminated, hardwood piece into which the wrest pins are driven. Its strength and accurate fitting beneath the iron frame is essential to the stability of the piano's tuning.

Zuggetriebe [Zugmechanik] (Ger.). A term coined by W. Pfeiffer to describe a German action in which the motive force is transmitted to the hammer beak by a mobile escapement lever.