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

Please select between the categories below to get started.
Question How do I correct bobbin thread showing on top of garment?

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.