force in the cable 74 is greater than this force of the spring 62 then the spring 62 will compress and the locking mechanism 18 will move to an unlocking position as shown in fig4 in fig4 the cable 74 has moved the hook 64 to the right or in other words towards the outer tube 14 because the hook 64 and the locking plug 34 are connected to each other the locking plug 34 is also moved to the right the spring 62 has become compressed between the locking plug 34 and the stop 40 because the locking plug 34 has moved to the right the first end 66 of the locking plug 34 could also move to the right and out of the first end 38 of the locking body 19 the reduced diameter of the first end 66 of the locking plug 34 has permitted the locking dogs 48 to move radially inward the angled wall 70 of the locking plug 34 has provided a camming surface for the angled portion 72 of locking dogs 48 to move radially inwardly along this movement caused the locking dogs 48 to move out of the locking groove 32 once the locking dog 48 has moved out of the locking groove 32 the outer tube 14 and the inner tube 12 are no longer locked together continued tension on the cable 74 permits the inner tube 12 to move with the locking body 19 into the interior 76 of the outer tube 14 as shown thus when the locking mechanism 18 is in the unlocked position as shown in fig4 the inner tube 12 is free to move into the interior 76 of the outer tube 14 thereby collapsing the hold open rod 10 moving the interior inner tube.