Good way to detach is to have the screen tilted a bit towards the front. In other words, begin closing the Surface Book, and when the screen is tilting slightly over the keyboard, then detach.
On the day of the hardware event when the journalists were getting hands on with the SB, I read somewhere that the Microsoft folks were showing them the corner thing as the proper (or at least easy) way to remove the clipboard. I guess they would know, huh?Thanks man, you rock! The corner thing works great btw.