Improved Penny and Brass Weight

A borrowed penny is dropped into the ring which is resting on the table. This is followed by the small brass weight, just large enough to cover a penny. With a snap of the fingers and spectator is allowed to remove weight. Includes the instructions. To everyone's surprise, the penny has changed to a dime! Precision made from brass with spring-loaded mechanism. A small crack to the ring (which is not material to the working of the trick), else in good condition.