Just snap plastic clip over bobbin.
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January 15, 2017
I bought these recently. I wish they were clear so I could see the color of the thread without removing the bobbin from the case. They also don't work if the bobbin is less than half full. I would not buy them again.
November 18, 2015
I use these all the time. It DOES keep tangling of thread down a lot.
May 2, 2014
I already use them and they do keep the frustration factor down!