How to Reposition a Cello Bridge
The bridge of a cello helps space the strings properly, convert the string's vibrations to sound and produce a particular brightness of tone. Held in place only by the considerable tension from the strings, a cello's bridge can lean or move out of place, especially during tuning when the tension of the strings is altered. If a bridge is left misaligned, it can permanently warp, resulting in a costly repair or purchase of a new bridge. To preserve the life of your bridge -- and the unique timbre of your instrument -- examine your bridge's alignment regularly, especially after tuning, and reposition it as necessary.
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Instructions
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Loosen the strings with the tuning pegs to create enough slack that the bridge can be moved, but not so much that it falls down. Ensure the strings stay in the grooves of the nut while positioning the bridge.
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Place the tallest side of the bridge under the lowest, or C, string (and the lowest side under the highest, or A, string). You should only need to do this when the bridge has completely fallen. A bridge already in place should have been installed this way.
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Position the bridge so that it stands at a 90-degree angle to the instrument.
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Align the bridge with the center of the F holes. They should have notches at their center points.
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Rest the strings in the grooves of the bridge. The grooves keep the strings evenly spaced and allow them to be sounded individually.
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Align the grooves of the bridge with the grooves of the nut.
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Tighten the strings to the proper tension and tuning, ensuring they've remained in both sets of grooves.
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Tips & Warnings
Each time you change the position of the bridge, you alter the placement of the notes. A major adjustment can significantly change the scaling along the neck. Some players purposely effect such change to better match the scaling to the size of their hand and fingers.
References
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