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en 
The needle spring is one of the small parts that directly affect playing comfort: it provides the necessary force for the key to return properly to position while maintaining a consistent feel under the fingers. On both clarinet and saxophone, a worn, bent, or broken spring can cause sluggishness, mechanical noise, or poor key closure.
This needle spring is primarily intended for technicians, repairers, and experienced DIY musicians who have the tools and expertise to replace and adjust spring tension. The choice of diameter and shaping must be adapted to the specific key to preserve the accuracy of the touch and the seal of the pads.
A needle spring does not directly affect the timbre, but it contributes to the reliable closure of keys and thus better sealing. A mechanism that returns properly helps stabilize sound production, limit air leaks, and maintain a consistent response across all registers.
