I am trying to sew on a cheap plastic tablecloth, single and double thickness. This is a new machine and I cant get the tension right. The underside thread is just a straight tight line, not a linked stitch. I have tried just about every needle thread tension with the same results. I have tightened the bobbin tension and loosened it. Am using a 14 needle, and two different color threads so I can see which is which. I checked to see that I have threaded the machine properly, and it is--maybe I should return the machine? Can you think of anything I can do to correct this? Thank you.
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