Description Effect: The thumb stocks are put on a helper and tightened down to lock their thumbs inside. They are asked to try and remove their thumbs from the stocks without hurting themselves. They will find that they cannot release themselves and are then released by the magician so that the stocks can be put on him. After the stocks have been placed on the magician, he can then perform any IN and OUT type routines or escapes as would fit the show.
