way of a harness the worker is working at height on a ladder it can be seen that if the worker were to fall from the ladder for some reason that the inertia reel would activate and prevent the worker falling to the floor below on completion of the inspection work the hook 40 is removed from the bow nut in the following manner referring to fig9 a hook attachment 70 is shown the hook attachment includes a hook 72 and a shaft portion 74 the shaft portion includes a through hole 76 to which is attached a second length of steel cable not shown of a similar gauge to the pull cord 46 the second length of steel cable is selected to be approximately the same length as the height of the work area the shaft portion 74 is a sliding fit in the bore 29 of bush 28 of handle 30 in a similar manner to the hook 40 the hook attachment 70 is fitted to handle 30 and the hook 72 is used to catch and retain the looped end of pull cord 46 when hook portion 70 is attached to pull cord 46 the handle 30 is withdrawn and the second length of cable which is inserted through hole 76 hangs down to ground level handle 30 is then offered back up to again receive shaft portion 45 of hook 40 then whilst pulling.