Abstract: An improved tuning peg construction 10 for applying selective tension on a string 101 of a musical instrument 100 wherein the construction includes a tuning peg member 20 having a threaded shaft 21 adapted to engage the toothed gear 103 on a tuning peg 102 attached to one of the string 101 of a musical instrument; wherein, the outboard end of the tuning peg member 20 is provided with a contoured post 20 that is received in a reciprocating fashion in a contoured recess 34 formed in a tuning knob member 30 which is normally spring biased into a free-wheeling spaced relationship with the tuning peg member 20 until such time as the musician desires to change the tension on the string 101 of the instrument 100.