Check the tension on the top thread. Be sure all is threaded correctly. If the top tension is ok, the bobbin tension may need to be tightened. Also, be sure that everything is oiled properly, as this can affect function.
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Check the tension on the top thread. Be sure all is threaded correctly. If the top tension is ok, the bobbin tension may need to be tightened. Also, be sure that everything is oiled properly, as this can affect function.