Nickel to Nickel

Two borrowed nickels are placed one on the other at the rims and the performer is able to balance them one on the other and is even able to cause the upper coin to spin by breathing on it.  You are supplied with 2 gimmicked nickels (yes, you must make the switch, or just begin with your own coins).  These are expertly machined and virtually impossible to detect.  The performer will be able to accomplish the "juggling" feat but the spectators will not, no matter how hard they try.