headstock

/ˈhɛdˌstɑk/
noun
  1. The part of a machine tool (such as a lathe) that holds the rotating spindle and drive mechanism.
    • He cleaned the headstock carefully to remove metal shavings.
    • A worn bearing in the headstock can cause vibration during cutting.
    • The machinist adjusted the headstock to change the speed of the lathe.
  2. The part of a stringed musical instrument (like a guitar or violin) at the end of the neck that holds the tuning pegs.
    • She replaced the strings and wound them around the headstock pegs.
    • The guitar's headstock was cracked near the tuning peg.
    • The shape of a headstock often helps identify the brand of the guitar.