i dont know what the " trick " is called. posibly the vanishing coin. However, the gimmick that makes it possible to do this effct , and many others has the same naome as a large black bird.
I am sory if i am being a bit cryptic, but using the clues i have given you , you should find it your self.
and even if it takes weeks, and weeks, it will be nowhere near as long as you will have to spend getting it right,
and when you do, i can also guarentee you will never use it.Because hardly anybody does.
yours in magic....