Originally Posted by donnajean
I use YLI Wonder Invisible thread in both top & bobbin. Just be careful winding the bobbin that it does not wind too tight. It will crack the plastic bobbins. I've learned to not fill the entire bobbin. Also, don't have the thread going through tension area when winding the bobbin. You can damage your machine.
Yup. I've done the same thing with the same brand of thread and it works great. I have metal bobbins, but I still fill them only about 3/4ths full. My bobbin winder does not have thread going through the tension area, so I never knew about that particular issue.
Oh, also be sure not to use high speed when winding the bobbin. Wind it medium-to-slowly and steadily. This helps avoid stretching the thread while winding.