Generally, tension is regulated via the top tension. If, in fact, the bobbin tension needs adjustment, it can be done although it is usually discouraged except by experienced sewists. It is very easy to adjust it too far one way or another. Be sure to mark the bobbin tension screw setting with nail polish before making any adjustments. This makes it easy to reset it to the original setting.
Understanding Thread Tension Threads
Bobbin Tension How and Why Tension is Adjusted
Understanding Bobbin Tension
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How to change the tension on a sewing machine?
Adjust your top tension if it's too tight. To decrease your top tension if it is too tight, turn your knob so the numbers are decreasing. Try ½ to 1 number lower, then test the stitches on a piece of scrap fabric. Continue until it looks even on both sides and you can no longer see the bottom thread on the top.
How to Adjust the Tension on a Sewing Machine: 13 Steps
www.wikihow.com/Adjust-the-Tension-on-a-Sewing-Machine
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