This Bernina type 232 foot control element is compatible with a varity of models. This element is what gives you the speed variations as you step down on your foot control. When it becomes worn out you lose the ability to vary speeds. Replacing this should end your problems and get you back to sewing in a flash. Once you have the foot control apart you should be able to visually tell this is the foot control element you need. As always if you have any problems with this , you simply return it in it’s original condition for a refund.