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Thread is bunching up underneath the fabric. Manual Fix: Page 15 – Your upper tension is too low. The manual specifies the standard setting is "4" for most cottons. Also, check that you have not forgotten to lower the presser foot (the manual has a bold warning about this).
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Finding a legitimate copy of a manual for older sewing machines can sometimes be tricky. Here are the best places to look for a digital download: Thread is bunching up underneath the fabric
: List of included feet (zigzag, zipper, buttonhole) and tools. Also, check that you have not forgotten to
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