Tailpiece - Gibson Electric Guitar Owner's Manual

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The tune-o-matic bridge was designed to adjust for string changes (gauge or type) and other
physical changes but not for problems with intonation due to string wear. Should a string lose
its intonation due to wear, we strongly recommend changing the string and not the bridge
setting.
Adjustable Stopbar Tailpiece.
The stopbar tailpiece may be adjusted up or down to change the
downward pressure across the bridge. There is usually no need to adjust the stopbar unless the
strings are moving out of the saddles, in which case the stopbar should be lowered.