See if this works with your machine
The Bobbin Work bobbin case can be filled with various thread materials. It allows the sewing of decorative stitches as well as free motion sewing using fancy yarns, small ribbons, metallic or rubber threads.
More details concerning the topic of lower thread sewing can be found in the tutorial section of your sewing mahine under Sewing techniques/Lower thread sewing.
Part Number: BER 034320.71.02
Guaranteed to fit because it is a part.