A guitar has a wrench tremolo bar thereon, replacing the standard tremolo bar, with the wrench tremolo bar having a desired wrench on at least one end of the wrench tremolo bar, to cooperate with the string fasteners on the guitar, which greatly facilitates {HEAD ~ tuning}, {TAIL ~ changing} or replacing of a guitar string 
A guitar has a wrench tremolo bar thereon , replacing the standard tremolo bar , with the wrench tremolo bar having a desired wrench on at least one end of the wrench tremolo bar , to cooperate with the string fasteners on the guitar , which greatly facilitates { HEAD ~ tuning } , { TAIL ~ changing } or replacing of a guitar string
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