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Dear Pfaff owner.. It sounds like your thread on top is not fully engaged with the top tension... Set the tension at normal... Now re thread the top of machine with the presser bar up... When you have gone through the tension lower your presser foot and make sure that you feel tension on upper thread...This should be the solution.. Also make sure that the Coats and Clark thread is not the heavy of a thread for your machine.. Sometimes these heavier threads get mixed in with the normal Coats and Clark thread..
Thanks that seems to have solvr the problem
Great Job !!