Need an equivalent to an old Hunts WA71 capacitor/rectifier?

I think the capacitor or rectifier (not sure which it would be) in the foot control of an old but still working Singer 99K sewing machine has failed. The machine still runs without it but without speed control. The capacitor or rectifier?? is a HUNTS WA71 IYU 0-1uF 250v.AC.
What modern unit can I replace it with please?