Viking Huskylock S21 Serger Machine Instruction Manual (Model S21) - 44 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 Viking Huskylock S21. 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.