Perfect Pen

Totally examinable. Only one pen is used. Nothing added or taken away. 

Effect:

Magician borrows a bill from a spectator. Then he takes a designer type pen an proceeds to push the point of the pen right through the center of the bill. Spectator actually hears bill being punctured. He then proceeds to rip the pen away from the bill. The bill is now slowly and fairly restored and handed back to the spectator. If desired, the pen may be made to penetrate any borrowed coin. 

There are no sleights required.