With the variety of thread weights available today, it is always wise to calibrate your bobbin case tension when you change thread weights, and especially on a new-to-you machine.

This handy meter allows you to measure the tension on your bobbin thread and adjust your bobbin case so that it is the recommended 23g for a Singer Featherweight, but it can also be used for other machines.

This video here shows you how to set your tension using the meter.

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