Bobbin Case Industrial economy

For Singer industrial models 95, 96, 191, 195, 241, 251 (except 251-21), 281 (except 281-21), 291, 331K, 366K, 400W491, 591, 600A, 600W, 660W, also Brother B714, B735, Consew 105, 210, 220, 230, 231, 2230R, Juki DDL-227, DDL-555, DDL-5530, DDL-5550, DDL-8500, DDL-8700, Kenquilt 622, Nolting quilter using L style bobbin, Tacsew T405, T810, economy