I have the same saw, I absolutely love it. The versatility is incredible. If you don't already have it, I can email you a copy of the owners manual. I also have a write up bookmarked that covers aligning the saw in great detail. As far as 110/220 do what ever is more convenient for you, I can say from first hand experience that your motor wires have likely lost all their color over the years and will all appear to be some shade of white. If you are set on changing to 110V I can send you a detailed schematic that shows how both 110 and 220 are wired so you can make the change even if the wires are all white in appearance. You'll potentially have to ohm out some of the wires to identify them (at least I did).