How do I thread the bobbin on the Brother XH2135-001?
Pull up the spool pin completely, wind the thread a few times around the bobbin, and turn on the machine to wind the bobbin. When the bobbin is full, it will spin slowly to indicate completion. Make sure to trim the excess thread above the bobbin after winding. (Page 2)
From the official Brother XH2135-001 Computerized Sewing Machine manual, page 2
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