Make sure when you thread the machine, that you have the presser foot (the foot that rides on the fabric) in the 'up' position.Also make sure you get the thread down between the discs of the upper tension. Set the tension on '4'. Usually when you get thread bunching up below it's caused by improper threading of the upper thread.
Hope this helps!
Bob
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http://www.fixya.com/marketplace/service...
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