I have this one from here. It works with my Bernina L bobbins and with the M bobbins for my quilting machine. It woks on my the L bobbins for my multineedle embroidery machine too. Diane has a featherweight, and it works with those bobbins too. Due to the design, it will work with just about anything. Expensive, but flawless. Diane is a quilter herself, and her husband puts her ideas into equipment.
http://fancyquilt.com/