How to Adjust a Mandolin Bridge
As with any musical instrument, the bridge of the mandolin must be positioned properly on the instrument to ensure that the strings are sounding the right tone, and ultimately, so that the sounds coming from the mandolin when played are pure and pleasant to the listener. If the bridge is positioned improperly, it will not be possible for this to happen. However, with a few appropriate measures, the bridge can be repositioned properly so that sound quality is true.
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Instructions
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Check all of the possible reasons the instrument might not have a clear sound, or be difficult to tune. If the strings are old, consider purchasing new ones, checking to make sure they are the appropriate gauge (made for a mandolin and not another instrument). Also check to see if there is a problem with the pegs. If, when they are turned they stick or slip, they may need to be replaced, as they will not allow the strings to maintain true pitch when tuned.
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Use the electronic tuner to tune the high E string. If this is flat, move the bridge slowly, slightly toward the neck until the appropriate tune can be maintained. If it is sharp, move it slightly toward the tailpiece, using the same method. In the case of a bridge with thumbwheels, it is simply a matter of adjusting the wheels until the string is properly tuned. This adjusts the height of the bridge, and performs the same purpose as moving the bridge.
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Perform the same function with the top G string until the proper sound is reached.
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Tune all remaining strings with the electronic tuner until they are on key according to the reading on the tuner.
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Tips & Warnings
Perform all preliminary checking. Be sure the problems of sound/tuning are not from another source before adjusting the bridge.
