Brother Overlock EF4-B531 Sewing Machine Instruction Manual (Model B531) - 24 Pages. Lost your sewing machine's manual? We've got you covered! This instruction manual is the ultimate guide to unlock the full potential of your Brother Overlock EF4-B531. No more confusion or frustration—just clear, concise instructions right at your fingertips. What's inside? Everything you need to know from setting up to mastering your sewing machine and all its features.