the key, the far end returns to its rest position, and the jack falls back; the plectrum, mounted on a tongue mechanism that can swivel backwards away from the string, passes the string without plucking it again. As the key reaches its rest position, a felt damper atop the jack stops the string's vibrations. These basic principles are explained in detail below.

* The keylever is a simple pivot, which rocks on a balance pin that passes through a hole drilled through the keylever.
* The jack is a thin, rectangular piece of wood that