Gibson Guitars 1550-07 GUS 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.