We may have found other answers which could help you.
Click here for Sewing Machine Thread Tension Tangled Thread
reattaching the bobbin casing and bobbin?
How can I correct stitching issues with my Sew Cute?
white model 1515?
Need a bobbin case for White Model 626?
how can I fix my white model 645 sewing machine?
I purchased a used white model 940 sewing machine and it doesn't stop?