Shuttle Tension Spring 8611/8603 is a precision-made spare part designed for the Singer 29K-71 Sewing Machine. It works with the shuttle hook system to regulate bobbin thread tension, ensuring smooth stitch formation and consistent sewing performance.
Key Features:

? Compatible with Singer 29K-71 sewing machine

? Works with shuttle hook parts 8603 / 8654

? Replaces tension spring part used in shuttle system (8611 type)

? Provides stable and accurate thread tension control

? Durable spring steel construction for long service life

? Helps maintain smooth, even stitching quality

? Easy to install and reliable in operation

An essential component for proper shuttle function and high-quality stitching results.

Orders are typically processed within 1–3 business days.

We ship from our Georgia, USA warehouse. If an item is temporarily unavailable in the U.S., we source it through our global supplier network and will notify you of the estimated lead time.

Free shipping is available on U.S. orders over $99.

Once your order ships, you will receive a tracking number by email.

For urgent orders or shipping questions, please contact us before placing your order.

We stand behind the quality of the products we sell.

• Genuine OEM parts are covered by the manufacturer's warranty where applicable.

• Aftermarket and generic parts are covered against manufacturing defects.

• If you receive a damaged, defective, or incorrect item, please contact us within 30 days of delivery.

• Warranty does not cover damage caused by improper installation, misuse, normal wear, or modifications.

If you have any questions, our support team is happy to help before or after your purchase.