Originally Posted by
Tartan
Well the good news is it is easy to remove so you can re-use your practice sandwich. Take a picture of your tension setting so you can turn it back for regular sewing. Tighten your top tension first, I f that doesn't help you can adjust your bobbin tension if your bobbin case has a little screw. Again, take a picture of the position before adjusting it.
Thanks for the advice about the picture!