{HEAD ~ 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 {TAIL ~ the string fasteners} on the guitar, which greatly facilitates tuning, changing or replacing of a guitar string 
{ HEAD ~ 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 { TAIL ~ the string fasteners } on the guitar , which greatly facilitates tuning , changing or replacing of a guitar string
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