DOMESTIC METAL BOBBIN CASE WITH NO BACK LASH
A special anti-spin spring is built into the bobbin case assembly to prevent the bobbin from spinning when the machine is suddenly stopped. If the bobbin spins when the machine stops, there is a good chance that a single loop of thread will fall out of the bobbin case.
This condition will cause the thread to snap as soon as the machine begins to sew.
WILL FIT BERNINA ARTISTA & AURORA
DOMESTIC SEWING MACHINES INC MODELS,
Will fit, BERNINA ARTISTA models 185, 640 and 730 &
will fit, BERNINA AURORA models 435 and 450 Machine.