I have the same machine and I mesed up the cutter by using 4 layers of denim for a bag.I took it in to Marietta`s in SC and The service tech fixed the thread cuter and completely serviced it and the price was $85.00.In your area it may vary.Atlanta Sewing Center service fee not fixing anything ranges from $75.00 to $100.00.You should check with your LQS.sometimes they have a tech that comes to their shop and services them for a lower price.