This is the only one I could find and it is $10.00 http://www.mcssl.com/SecureCart/ViewCart.aspx?mid=F506721D-3C9E-481E-8B3F-7E1C3114072F&sctoken=0465a6a54d8e482581a12d868a00a3fb&bhcp=1
The reason for the jam could be the fabric is thick and this causes the foot to raise to the point the the tension is open that the top thread is feeding erratically.
Another could be the bobbin area needs to be cleaned.
Lastly, it could be the timing needs to be adjusted and this means a trip to the sewing machine dealer for service.
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