Hold the bobbin case in your left hand, with your right hand, insert the bobbin with the thread unwinding from the right. Pull the thread through the small slot in the top of the bobbin case, then hold the bobbin tight and pull the thread under the bobbin case tension spring ( a flat piece of metal). When you pull the thread out, there should be some tension on the thread and the bobbin should unwind counter clockwise. If there is no tension on the thread, it's not under the tension spring on the case. If the bobbin turns the wrong way, remove it and turn it around, and put it back in.
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