Albert King is another lefty who played a right handed guitar without re-stringing. He could bend those high strings three steps, because he would yank down on them, and there was plenty of fretboard to hold his note. He was, by all accounts, a very powerful guy. Somewhat related to this.....all of the top chefs in the world train themselves to be able to do critical kitchen activities with both hands, in case they injure themselves. Knife skills are very important to these guys, and being able to do what they do with both hands keep them running their kitchens. An aside to this....I myself try to do this when I'm at work, and I have discovered something interesting. I can use a whisk with my right hand like nobodys business, but I just can't get the motion right with my left.....UNLESSS, I cross my hands like you sometimes see drummers doing. If I cross my left hand under my right, so that the bowl I'm whisking in is on my right side, I can whisk both bowls at the same time. Oh brain, you are so weird.