Machine? most tension screws have nothing to do with bobbin
Don't know what your machine is... Just guessing here. If your bobbin case is metal and there is a tiny screw on the side, you can tighten the bobbin tension by turning the screw clockwise. (Recommend turning only 1/8 of the circumference, then re-check, then turn another 1/8, etc. until the tension is where you want it.) If it becomes too tight, turn it counter-clockwise.)
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