I'm purchasing a unit the operates on 120v OR 240V with the flip of a switch. The manufacture tells you to cut the cord to make the change from 120v to 240v. With that said, I'd like the flexability to use this unit on either 120v or 240v whenever I please. I'd like to use my existing 240v receptable that my dryer uses or any other 120v receptacle of my choosing. In the video below, a guy makes a cord that would serve that purpose. 120v to 240v plug in Thoughts on this cord? I'm not an electrician. I understand the reason why the company tells you to cut the cord.