1. AN ACTUATOR COMPRISING A BODY HAVING A BORE FORMED WITH AN OUTER END AND HAVING A RECESS LATERALLY ADJACENT SAID BORE, A SWITCH OPERATING ELEMENT IN SAID RECESS AND EXTENDING INTO SAID BORE, A SHUTTLE SLIDABLY MOUNTED IN SAID BORE HAVING MEANS THEREON FOR OPERATING SAID SWITCH ELEMENT AND HAVING AN OUTER END, COOPERATING MEANS ON SAID BODY AND SAID SHUTTLE FOR LIMITING THE EXTENT OF MOVEMENT OF SAID SHUTTLE TOWARDS THE OUTER END OF SAID BORE, A PULL HANDLE, A FLEXIBLE ELEMENT CONNECTED AT ONE END OF SAID HANDLE FOR MOVEMENT THEREWITH AND EXTENDING THROUGH SAID BORE, COOPERATING MEANS ON SAID HANDLE AND SAID BODY AT THE OUTER END OF SAID BORE FOR RELEASABLY LOCKING SAID HANDLE ON SAID BODY, AND COOPERATING MEANS ON SAID HANDLE AND THE OUTER END OF SAID SHUTTLE FOR LOCK-