Shuttle Hook Tension Spring 8611 - Bobbin Case Tension for Singer 29K Cobbler Machines
Shuttle Hook Tension Spring 8611 - Bobbin Case Tension for Singer 29K Cobbler Machines is backordered and will ship as soon as it is back in stock.
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Shuttle Hook Tension Spring 8611 - Bobbin Case Tension for Singer 2...
Description
Description
Shuttle Hook Tension Spring 8611 - Bobbin Case Tension Regulator
Part Number: 8611
Type: Shuttle hook tension spring (flexible metal plate)
Related Parts: Works with Regulating Screw #662, fits Shuttle Hook #8603 (small bobbin)
Function and Purpose:
The Shuttle Hook Tension Spring is a small, flexible metal plate that regulates the thread tension on the bobbin case for vintage and industrial shoe patcher sewing machines. This critical component sits on the outside of the shuttle hook (bobbin case) and controls the resistance applied to the thread as it leaves the bobbin, ensuring balanced stitch formation.
Key Functions:
Tension Regulation: Squeezes the thread as it leaves the bobbin, creating the necessary resistance for balanced upper and lower thread tension. Proper tension is essential for consistent stitch quality on leather goods and heavy materials.
Stitch Quality: A worn or broken spring is a primary cause of skipped stitches, thread breakage, and loose or irregular stitch patterns. Replacing this spring restores proper tension control and eliminates common stitching problems.
Maintenance: Because the thread constantly slides against this spring during sewing, it can eventually develop a groove or lose its springiness. Replacing it is a standard DIY repair for restoring a machine to smooth operation and professional stitch quality.
When to Replace:
Replace this spring if you notice loose stitches, skipped stitches, thread breakage, or if the spring shows visible wear grooves or has lost its tension. Regular replacement ensures consistent stitch formation on leather and heavy-duty materials.
Compatible Singer Models:
Singer 29 Class: 29-1
Singer 29K Class: 29K71, 29K73, 29K171, 29K171A
Singer 29U Series: 29U171A, 29U173A
Cross-Brand Compatibility: Certain Elna industrial models that utilize the same shuttle hook assembly
Professional Tip: Adjust tension using the Regulating Screw (Part #662) after installing a new spring. Proper adjustment ensures optimal thread tension for leather work and prevents thread-related stitching issues.
Specifications
Specifications
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