Cello Rib Crack Repair Without Removing the Top | Rib Alignment and Clamping Method

This student cello had a rib crack extending from the C-bout to the end block, and the rib had shifted slightly out of shape. Since the instrument did not justify removing the top, the repair was done by opening the back seam and carefully clamping the rib back into alignment using wedges and bar clamps to restore its original shape.

Rib Crack Alignment Repair Steps

• Open the back seam: Carefully release the back seam to allow controlled movement and easier alignment of the rib crack.
• Perform a dry clamp test: Do a quick trial clamping to confirm the rib can be brought back into proper alignment before applying glue.
• Begin alignment at the C-bout: Starting near the C-bout, gradually align the crack while applying clamps along the length of the rib.
• Use wedges and bar clamps: A combination of wedges and bar clamps is used to correct the distortion and hold the rib in its proper shape and alignment.
• Secure the instrument overnight: Strap the cello safely to the bench to prevent movement or tipping while the repair dries.

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This repair is still in progress. The rib crack aligned very well during clamping, and after removing the bar clamps I allowed the instrument to remain secured for several additional days to ensure the joint set firmly and remained stable. Because of the length of the crack, I am considering adding internal cleats using wires and magnets to provide additional structural support. More photos and updates will follow as the repair progresses and a final decision is made.

Here is another example of repairing a cello rib crack without removing the top. By clamping the rib against a mold, the crack could be held in proper alignment while controlled pressure was applied to close the joint. It’s a simple but effective approach that restores stability while avoiding more invasive disassembly of the instrument.

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