I purchased Pfaff 1221 and 1222 machines on E-bay without foot pedals. I think the proper foot pedal is AT 0001 for both these machines. Since most of the motor controller electronics are inside the machine, all there is in the foot pedal is a potentiometer. The later Pfaff 1221's and 1222's used 20 kohm potentiometers in the foot pedals but they don't seem to work with the earlier machines that I have. Does anyone know what is the value of the potentiometers used on the earlier machines?