Assertion: harpsichord's mechanism | /r/MadeOf | sets of jacks
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text: The plucking mechanism consists of sets of jacks, thin vertical strips of wood that rest on the far ends of the keys and pass through a lower fixed guide and an upper slide, or movable guide; the slide moves a given set of jacks either slightly toward or slightly away from its set of strings, depending on whether that set is to be used or unused.