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11 - Wrest-plank, wrest-block/ pinblock, pin block
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The pinblock (also known as the wrestplank or tuning pinblock) is a wooden structure located at the back of the piano that supports the tuning pins. The tuning pins are long, thin metal rods that hold the strings in place and allow the pitch of the strings to be adjusted. Each string in a piano is attached at one end to the plate (also known as the harp or frame) and at the other end to a tuning pin. The tuning pins are inserted into the pinblock and are tightened or loosened to adjust the tension of the strings. The pinblock is typically made of a hardwood such as maple or beech and is subjected to a great deal of stress due to the combined tension of all the strings, which can be more than 20 tons. It is important that the pinblock be strong and stable in order to ensure that the tuning pins remain in place and the piano stays in tune.
