If you have a Bernina sewing machine that was made before 1996 then you will need this adapter to work with the snap-on feet that are sold in my store. 

Compatible with Bernina Sewing Machine Models that are made before 1996:

1000, 1001, 1004, 1005, 1006, 1008, 1010, 1011, 1015, 1020, 1030, 1031, 1080, 1090, 1120, 1130, 1230, 1260, 1530, 1630 

900, 910, 930, 931, 932, 940, 950 

800, 801, 802, 803, 807, 808, 809, 810, 811, 817, 818, 819, 830, 831, 832, 840, 841, 842, 850 

700, 707, 708, 709, 717, 718, 719, 730, 731, 732, 740, 741, 742, 744 

600, 610, 640, 642, 644 

530, 532, 534, 540