(C) Disney (C) & TM Lucasfilm Three years ago, Disney revealed the most convincing replica of a Star Wars lightsaber ever devised - one whose glowing blade fully and automatically retracts inside the handle due to a cleverly patented device.Now, its lead inventor, Lanny Smoot, says he's hoping that lightsaber might turn into a product you can actually buy - and it sounds like plans could already be in motion, unless Smoot was misinformed.At Disney's D23 fan expo last month, a fan asked that question with a camera rolling, as documented by YouTuber Finding The Force. Smoot replied: