Elna 664PRO Serger Machine Instruction Manual (Model 664PRO) - 50 Pages. Lost your serger machine's manual? We've got you covered! This instruction manual is the ultimate guide to unlock the full potential of your Elna 664PRO. 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 serger machine and all its features.