I have one like this. The cord is only for the power, just a plug, not the plug/foot pedal. You can convert to that type put you need to rewire under that plug on the back of the machine. Basically it only uses the two outer outlet pins. A cord with plug and foot pedal uses all three so you have to change the wiring behind the connector so that it uses the middle pin instead of the control box. This is not hard to do, but it won't work until you connect that "connection" up. I
With this one, the power goes through to the machine and then down to the controller in the box. The controller replaces the foot pedal and is run by a knee bar that goes into that hole on the case. That is why you see the two wires going from the three prong plug to the controller.