Question about Singer Drop-In Bobbin 758B-28BH Mechanical Sewing Machine
The top tension pulls the top thread up. The bobbin tension pulls the bottom thread down. A balanced tension is an an even knot between the stitches.
If the thread is messy on the bottom, the top tension is non-existent or is too low. The top thread tension dial should be on 4 or 5. Pull the thread out and re-thread the machine with the presser foot up. If it is still messy, perhaps there is a burr on the bobbin case snagging the thread.
Posted on Jun 19, 2009
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Posted on Jan 02, 2017
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