A spectator's ring is borrowed and placed into a small box said to polish it to an unbelievable shine. The ring is heard to rattle in the box as it is shaken to seat the ring properly for cleaning. The spectator is asked to turn the crank to begin the process. Suddenly a clacking sound is heard as the magician says, "Oh no, you didn't seat the ring properly, open the front door and dump it out and we'll start again."
The spectator opens the front door and finds the ring has been crushed into tiny pieces. The pieces are placed into a handkerchief and made to disappear. The ring is then found fully restored wherever the magician chooses.
The box is solid walnut and measures 2 1/2 x 2 1/2 by 3" so it's a perfect size, not suspiciously large. All the hardware is solid brass or pewter, except the gears which are chrome steel to last forever. The ring is always safe, it never comes close to the gears, the entire unit is partitioned off.