Martin Guitar Company 0-45s stephen stills ユーザーガイド

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Strings don’t last forever. As you play your guitar, you will
notice its sound will gradually lose brilliance. It will begin 
to sound slightly muffled because the strings have begun to
wear out. Human skin moisture causes strings to become 
dirty and corrode, and this layer of corrosion eventually 
deadens the sound of the strings. At this point, the entire 
set should be replaced. Replacing only one string causes 
an unbalanced sound.
Martin 6-string guitars are made for strings no 
heavier than medium gauge, and 12-string guitars
should have lighter gauge.
Adjusting the Action
Often as a guitar ages, it seems to get harder to play. This is
because the height of the strings above the fingerboard has
increased slightly. This height, usually called “action,” is 
very important to the playability of the instrument. However,
if the strings are too low, they will buzz against the frets. 
The action can be adjusted at the bridge and saddle by 
a competent repair person.
The adjustable neck rod is not for action adjustments; it 
is to be used to obtain the proper neck relief and should 
also be performed by a competent repair person. Though
straightening will have an effect, the neck should not be
adjusted if it is already in proper alignment.