I don't recommend playing with your tension. Most newer machines you set your tension and forget it. If there is a time that you need to play with the tension, you will know when and where to set it. Otherwise leave it alone, or you will be taking your machine back to your dealer and paying them to reset it. DO NOT play with your bobbin tension because it's so hard to get it back to normal. If you do want to play with your bobbin tension, then I would get a second bobbin case for playing around with. Here again dealer will need to reset and cost you upwards of $100.
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Until next time,