tuning peg 
noun
Any of the pegs in the neck of a stringed musical instrument around which the strings are wound, and which are turned to adjust their tension and so tune the instrument.He traced the flawless black ivory of the fingerboard, moving up to the tuning pegs, to continued on to curl along with the scroll at the end....
- When I finally got the parts, he told me that when i change the tuning pegs, there will be extra holes on the headstock.
- The strings shone silver in a frame of midnight ebony, and faceted gems flashed back the fire from the tuning pegs.
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