i bought a wand called a penny wand which i asume uses the same principle ie you borrow a ring drop it in a borrowed cup stir with the wand and hey presto the ring is gone.
it appears in a seald bag in a bag, in a bag, or mabey in that marvelouse brass thingamy i have just read about on this site
mine is made of metal not wood but its a good effect.
the blurb suggests that you can push it through a paper note or coat, move it around and pull it off the end.
hey presto no tear, i wouldn't recomend this part its to dodgy.