Hi janna
have you tried adjusting the top tension first?
if you have a drop in bobbin then it has to be adjusted at a sewing shop
the bobbin case you take out of the machine you can, using a small screw driver,,here's how
lower bobbin tension--
to test the bobbin tension,
remove the bobbin case & bobbin,,
hold it by suspending it by the thread,,
**** it once or twice,,
if the tension is correct, the thread will unwind by about an inch or two
if the tension is too tight, it does not unwind at all
if the tension is too loose, it will drop too much
to adjust turn small screw on the side of the bobbin
to the left is tighten
to the right is loosen
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