24a in the insertion chamber 58 which has been threaded onto safety cable 20 to pass outwardly from the ferrule holding member 52 once ferrule 24a has cleared the edge portions 58a and 58b the natural resiliency of the ferrule holding member 52 returns its lower portion to the configuration illustrated in fig6 a to prevent other ferrules from being ejected spring 64 then urges the stack of ferrules downwardly such that ferrule 24b is now located in the insertion chamber following the removal of the ferrule holding member 52 elongated body 46 is moved in the direction of arrow 80 as illustrated in fig5 c to insert the ferrule 24a into the opening 48 as illustrated in fig7 at this point it is necessary to apply a predetermined tension to the safety cable 20 before permanently attaching ferrule 24a to the cable by crimping this is accomplished by attaching the end of safety cable 20 to a tensioning device generally indicated at 82 in fig3 and 8 the tensioning mechanism is illustrated in fig8 12 the tensioning mechanism according to the present invention comprises a one way rotation mechanism 84 which may be any known commercially available device tension member 86 is inserted through one way rotation device 84 such that its headed portion 86a is located on one side of the mechanism 84 while a safety cable gripping portion 86b extends out the opposite side end 86b may define a slot 88 having an enlarged inner portion.