Jeez, Ben Heck is on a roll lately, he just made a one-handed Xbox controller, he writes –
“One of the biggest challenges, at least in the brainstorming “how I am going to do this?” phase was how to do the right analog stick. Then I realized I could just put it on the bottom of the controller and reverse its wiring. You don’t actually tilt the controller on the axis of the stick because that would be awkward. (Believe me, I tried) Instead you actually just move the whole thing in the direction you want for the right stick, and the analog stick then rotates against your leg. This is why you have to reverse the wiring, because the use of the stick itself has been reversed.” [via] – Link.