What is the correct way to wind the bobbin?
Wind the bobbin properly to avoid tension loosening and needle breakage. Pull up the spool pin completely, hold the bobbin down, pass the thread through the tension-adjusting spring slit guide, wind the thread a few times around the bobbin, and when the bobbin is full, it will spin slowly.
From the official Brother XH2149-001 Computerized Sewing Machine manual, page 2
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