.There is a little screw attached to the bobbin carrusel. You can try
to turn it just a little bit. The reason is that this carrusel gets
loose after a while.
Clean and oil your machine at least monthly.
Hope something helps!
Set the top tension as recommended by the mfg - this is usually between 3 - 6.
Now re-thread the machine with the presser foot up and see if this doesn't eliminated the loopy stitches.
What appears to be an issue with the bobbin may actually be the top thread was not seated into the tension during threading and the tension cannot control the flow of thread to the needle and you get a loopy stitch.
Keep the bobbin case clean as built-up lint can cause stitching problems.
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