Frequently Asked Questions
FAQ knowledge base
FAQ knowledge base
View our online knowledge base for the answers to the most frequently asked questions.

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Question How do I correct bobbin thread showing on top of garment?
Answer

There are many may causes for this problem.  The following is a list of possible causes and fixes:

  • Bobbin tension too loose.

Tighten bobbin case (also see Setting Bobbin Tension).

  • Upper thread tension is too tight.

Loosen upper thread.

  • Bobbin case is dirty.

Clean bobbin case.

  • Bobbin tension spring is missing or weak.

Install, replace, or bend spring slightly to restore tension.

  • No backing being used.

Use correct backing.

  • Scratches on rotary hook.

Polish with crocus cloth of #52c crocus cord if scratches are minor.   Replace if scratches are severe or rotary hook is scored.