First of all, be absolutely certain that the problems being experienced are not a result of the upper thread tension, ie threading when the presser foot is not in the up position, thread pathway is correct, a brand-new needle compatible with the thread and fabric, etc.
Before making any adjustments to the bobbin tension, be sure to mark the bobbin case where the skrew slot sets with permanent marker or a small drop of nail polish. This will allow you to reset it to original should your adjustments not be successful. And, make only minor movements of the tension adjustment, ie 1/8th of a turn, then re-test, before making another adjustment. Tiny incremental changes will make a huge difference in the outcome.
Understanding Bobbin Tension
Bobbin Tension How and Why Tension is Adjusted
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Understanding Thread Tension Threads
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Where the bobbin thread comes of the bobbin and out the bobbin case , there is a slot to flat spring under which you pull the bobbin thread
that flat spring is the tensioner and the small ***** is the adjuster
a bit turn is a lot of adjustment of the tension so be careful
Mostly that doesn't need adjustment as the main problem encountered is bunching up under the material which is a result of the needle thread tension being to loose
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