Bobbin Case Tension Spring - Singer Part # 45789

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This replacement bobbin case tension spring (part # 45789) is designed for Singer Featherweight and Model 301 bobbin cases. This small but critical component maintains proper bobbi n thread tension for consistent stitch quality. Replace worn or rusty tension springs to restore optimal bobbin case performance. Specifications: Part Number: 45789 Type: Replacement (aftermarket) Function: Maintains bobbin thread tension Works with bobbin cases 45750 and 45751 Machine Compatibility: Singer 221 Featherweight: Fits all variations of the standard model Singer 222 Featherweight: Fits the 222 Free-Arm "Free-Motion" models Singer Model 301: Fits Model 301 and 301A Show more