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Bobbin tension testing using magnetic bobbins


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Brand new to my new Millie. Took the paper bobbin out & put magnetic one in. Bobbin house would not slide down the thread like it did with paper bobbin. I did remove the check spring as instructed. How do I determine correct bobbin tension with magnetic bobbins?

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Here's a link. Lots of them available on Amazon and various suppliers. It allows you to measure the force needed to pull the bobbin thread around the pulleys and you adjust the bobbin case screw to get the "number" needed.

https://www.superiorthreads.com/product/notions/tension-gauges/    It's a great tool and I've used mine to test every bobbin for many years.

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