This is a very efficient and deceptive move by Steve Draun. A card which is inserted into the deck automatically ends up in the gambler's cop.
Chris Wasshuber independently developed this move in 1993 during his stay in Japan including an important visual convincer. If you want to learn this improved variation email him. He might be talked into releasing it. If you can't get Chris to talk then check out the Huot/Duperre control from Magic Menu volume 10. It is very similar to what Chris is doing.