This ring is used to drive the bobbin winder mechanism.

More Positive Bobbin Winding on Ultrafeed^® Sewing Machines. This ring greatly improves contact between the ring and the balance wheel resulting in more consistent bobbin winding and fuller bobbins. It is standard on all new Ultrafeed machines.

Fits the following Sewing Machines:

• Sailrite^® Ultrafeed^® LS-1
• Sailrite^® Ultrafeed^® LSZ-1
• Sailrite^® Leatherwork^®
• Sailrite^® SR200
• Sailrite^® SR200 Long Arm
• Sailrite^® Apprentice
• Sailrite^® Sailmaker
• Stitch Master^®
• Brother B651
• Brother B652