The walking foot is a specialty sewing machine foot that costs more than other feet and can take some fiddling to put on. There is a little bar that usually fits over the needle tightening screw. If you don't put it on right it makes a terrible noise and you'll know something's wrong. THIS BOOK FEATURES: Easy to follow instructions and step-to-step approach. Do-It-Yourself (DIY). The process is clear and simple to understand. No complications of process and information. Beginners friendly. Grab your Copy Now!!!!!!!The walking foot is a specialty sewing machine foot that costs more than other feet and can take some fiddling to put on. There is a little bar that usually fits over the needle tightening screw. If you don't put it on right it makes a terrible noise and you'll know something's wrong. Grab your Copy Now!!!!!!!