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brother sewing machine?

the bobbin thread keeps on bunching up when i try to sew
doryen, October 2010
You need to sort out the tensions, top tension about 4 or 5, pull the thread through on the bobbin case with some resistence, if it is too tight slacken the screw on the bobbin case about a quarter of a turn left and test each time

drivewithken, October 2010
link Click here to see other fixes for Brother.