Knowledge Base:  
Action and Intonation - Ukuleles
Last Updated: 02/23/2022
On new instruments we set the action at the 12th fret to be
between .080” and .100” (2.0 to 2.5mm). Generally the instruments are
very stable and should not require further adjustment however natural
materials and changes in the environment may cause the neck or top to
distort over time. If the bridge has a removable saddle, its fairly easy
to make adjustments by loosening the strings, removing the saddle and
sanding to lower, or shimming to raise the strings. One piece bridges
can be filed to lower action if necessary. Too low action can cause
buzzing on the frets; too high action may make it more difficult to fret
and could cause distortion up the neck.

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