So is it that you have 2 different types of string material and even tho one. Sometimes a little lint or stray thread can cause a lot of problem in the tension area so a regular maintenance of your sewing machine is a must before you make tension changes some new generation high quality prohibitively expensive sewing machines come with automatic tension adjustment you should not adjust tension of the bobbin case or the top tension unit in these machines. The spring can also completely uncoil.
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