Have a second bobbin case set with a looser tension for decorative bobbin work so you can leave your main bobbin case tension as is for general sewing
The foot is "spring loaded" which helps keep the fabric from lifting as the needle moves in and out of the fabric
thread and stitch are all contributory factors to the final effect
Does not fit Swiss made Elna models
Also use the Brother/Baby Lock Adjustable Blind Hem Foot with the adjustable guide will do precision edge stitching
Piping Feet Husqvarna Viking Bobbins & Other Accessories Have a second bobbin caseMake and Insert Perfect Piping, Available In Five Sizes Making and inserting piping into any sewing project is fast and easy with these piping presser feet. Available separately in five sizes, (1 8", 3 16", 1 4", 3 8", 1 2") one is just right for your garment, upholstery or home dec project. Includes instructions. Low shank foot.