Borrow a ring, lock it securely on a 4-digit combination brass lock and thoroughly mix the FOUR combination dials.
Your spectator can test that the lock cannot be opened.
Your spectator thinks of a 4-digit number.
When she is handed the lock, and then dials each number on the lock.
THE LOCK OPENS!
The numbers your spectator chose are the combination that opens the lock!
This clever effect is COMPLETELY MECHANICAL- no skill needed, and it is built to last.
Your spectator thinks of the number, your spectator rotates the dials, your spectator opens the lock- it's that simple!
It seems impossible!
But there is no force of any 4-digit pre-set numbers!
No electronics, magnets, buttons, switches, wires, gravity switch, timers, smoke or mirrors!
Nothing is added or taken away- except maybe your spectator's breath!