Description Juki Check Spring 229-21605 The idea of the check spring is to check the cotton as it goes around the sew mechanism of the sewing machine. The check spring allows for the tension of the thread to be lighter with in the sewing cycle, so helps considerably with pucker on lighter fabrics. The check spring is a vital component when it comes to achieving a balanced stitch on the item you are sewing Juki DDL-8700 Check Spring Juki DLN-5410N Class of machine Part No 229-21605
