Is the top thread not pulling down into the fabric? If so I would check the bobbin thread. Is it threaded right? If so you should be able to set the bobbin tension buy holding the thread in you hand, the bobbin case should not fall, when you shake it it should drop a few inches. Thread bobbin in bobbincase. Hold it buy pigtail. Shake it and it should drop about a few inches. You did not say your model number, this will help me, help you . Thanks
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