For those doing the 220v to 110v conversion, here is all you need: JJP Part #99-000139-00 (Power Box Assy, USA)
The official JJP USA Power Cable is also part #19-009000-00 (Line Power Cable, USA SJT 18 AWG)
It is a complete power wire harness plus outlet/switch cover that will replace the original. For swapping the easiest thing to do is to start by replacing the 220v outlet/switch cover with the new one and then work towards the back of the machine and finally up into the head. As you go, its easiest to remove the old harness connections and immediately replace with the new. Takes about 30 minutes in total.