Well, first check to make sure that your machine is on a level surface and is completely balanced. Now totally unthread, insert a new needle, now with the presser foot up, rethread according to your manual, pull the top thread-it should move smoothly. Now put the presser foot down, it should barely move. This should seat your thread in the tension discs properly. If, this does not work, call Singer at 1-800-4singer and find out what the story is.
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