Truss rod
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The truss rod is a component of a guitar or other stringed instrument that stabilizes the lengthwise forward curvature of the neck. Usually, it is a steel bar or rod that runs through the inside of th
Truss rod adjustment bolt visible from the top of headstock
Adjustment bolt visible through the sound hole.
Guitar
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The guitar is a stringed musical instrument that is usually fretted and typically has six or twelve strings. It is usually held flat against the player's body and played by strumming or plucking the s
Instrument labeled "cythara" in the Stuttgart Psalter, a Carolingian psalter from 9th century Paris.
19th-century guitar made by luthier Manuel de Soto held by Spanish guitarist Rafael Serrallet
Guitar collection in Museu de la Música de Barcelona
The Guitar Player (c. 1672), by Johannes Vermeer