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Springs

Check springs (the thread take-up spring on the tension unit), bobbin-case tension springs, presser-bar springs, feed springs and the small return springs that sit on levers and latches, listed by the models they fit. A check spring may need replacing: when it breaks or loses its set, the top thread loops on the underside at the start of every seam and the machine skips at slow speed. A bobbin-case spring that has been nicked by a needle or over-tightened makes bobbin tension impossible to set and shows as thread bunching underneath.

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Springs are cheap and sold singly; most are bundled with the part they fit where that makes sense. Order by the models named on the page — spring rates differ between models that look alike.

Frequently asked questions

What does the check spring do?

It takes up slack in the top thread as the needle rises so the loop forms correctly for the hook. A broken or weak one causes loops underneath and skipped stitches at slow speed.

Can I replace the bobbin-case spring or do I need a new case?

If the case itself is undamaged, the spring alone fixes it. A case that has been dropped and dented should be replaced whole.