1. A PUSH-TURN KEY COMPRISING: AN L-SHAPED HEEL PIECE HAVING SHORT AND LONG LEGS AND HAVING A PERFORATION IN SAID SHORT LEG, A ROTATABLE AND AXIALLY MOVABLE SHAFT PROJECTING THROUGH SAID PERFORATION AND JOURNALLED THEREIN, A SHOULDER ON SAID SHAFT ENGAGING SAID SHORT LEG TO DEFINE A FIRST FIXED AXIAL POSITION OF SAID SHAFT, A LOCKING PLATE, FIXED UPON SAID SHAFT, SPACED FROM SAID SHORT LEG AND CONTAINING A PLURALITY OF PERFORATIONS, A LOCKING PIN FIXED UPON SAID SHORT LEG AND PROJECTING THROUGH ONE OF THE PERFORATIONS IN SAID PLATE WHEN THE SHAFT IS IN SAID FIRST POSITION, A MOUNTING BRACKET FIXED UPON SAID LONG LEG AND CONTAINING A PERFORATION THROUGH WHICH SAID SHAFT PROJECTS AND IS JOURNALLED THEREBY, A SECOND SHOULDER ON SAID SHAFT SPACED FROM SAID BRACKET WHEN SAID SHAFT IS IN SAID FIRST POSITION AND MOVED INTO ENGAGEMENT WITH THE BRACKET AS THE SHAFT IS MOVED AXIALLY TO DISENGAGE SAID PIN COMPLETELY FROM SAID PLATE, THEREBY TO DEFINE A SECOND AXIAL POSITION OF SAID SHAFT, A HELICAL SPRING ENCIRCLING SAID SHAFT AND ENGAGING SAID BRACKET AND SHAFT AND TENSION TO BIAS THE SHAFT INTO SAID FIRST POSITION, SPRING ASSEMBLY MEANS FIXED UPON SAID LONG LEG AND INSULATED THEREFROM, AND A CAM FIXED UPON SAID SHAFT AND ROTATABLE THEREWITH TO OPERATE SAID SPRING MEANS AS SAID SHAFT IS ROTATED WHEN IN SAID SECOND POSITION.