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Using the Double Needle, WITHOUT the 2nd spool holderYou can also wind a bobbin and use the bobbin as the second spool of thread. Just put it on the little thing on top of your machine that you put it on to wind it. At least, that’s what my high school sewing teacher had me do.
Vintage sewing needle package--still have a lot of these. Mom always had a good supply for her sewing, and she also used these things to get slivers out of my hand after she had dipped the end in alcohol --did the trick.