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