Here is how it is done.
The spools are placed on the machine as shown in the first picture below. The black thread will be used to sew. The brown thread will be wound on the bobbin.
The machine is threaded with the black thread on the spool on the left.The bobbin will be wound with the brown thread on the right.
The picture on the left shows the top of the machine. The thread that will be wound on the bobbin is placed as instruction in the sewing machine's manual, exactly as it would be if the machine were only to wind the bobbin.
The bobbin winding can be ignored as the machine sews because
the machine will stop winding the bobbin when the bobbin is fully wound.
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