Where the foot control has a circuit board, you may not be able to wire a basic electronic foot control onto the cord. Some of the parts are still available from Bernina, but not the whole foot control. If the plastic housing parts are broken, I'd bet that your local Bernina dealer has a few spare parts in the bone yard that he/she would sell. The register plate (little circuit board) is part #004346.50.00 and retails for $31.00. The cabon tracer pins are part #32355.03.1+ and retails for 3.50 each.
Has anyone here replaced a circuit board foot control with an electronic one?