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A bobbin winder rubber ring is a small but essential part of a sewing machine that helps grip the bobbin while it is winding thread. This part is typically made of rubber or a rubberized material to ensure a secure, frictional fit on the bobbin winder shaft.For brands like Brother, Juki, and Jack, this rubber ring is important for ensuring smooth and consistent winding of the bobbin without slippage. If your machine is not winding the bobbin correctly, a worn or damaged rubber ring might be the cause.