I have a Singer 257 sewing machine. The needle side zig zag looks good. The bobbin side is a straight line--no zig zag. Is this out of time or what? Something simple or not?
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Perhaps your bobbin needs to be reversed?
The tension on the bobbin needs to be adjusted. Remove the needle plate and there will be a screw near the bobbin case. Refer to the manual as to which direction tightens the tension and vice versa.
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