33 and then rotated slightly so that the ears 34 thereof engage notches 36 in the wedges to retain the spade in a fastening position in case 14 shown in fig1 two such spades are held simultaneously in side by side relationship to engage two spade receiving members when the locking device is assembled as will be more fully described hereinafter referring again to fig1 insert 16 includes top wall 38 bottom wall 39 and opposed sidewalls 42 thereby defining a rectangular box 44 of slightly smaller outer dimensions than the inside dimensions of box 30 so that box 44 may be telescopically received therewithin the insert 16 further includes inwardly projecting detents 46 integral with the top wall 38 which engage the edges of retainers 48 on spade receiving member 12 the detents function to hold spade receiving member 12 in position within insert 16 in spade receiving relationship to the spades in case means 14 fig2 shows detent 46 more clearly wherein it can be seen that head 50 includes a hook 52 which is engageable with crimps 54 to prevent the spade receiving member from being either withdrawn from or extended further once inserted through first end opening 56 into insert 16 thus spade receiving member 12 cannot be either forced forwardly completely through insert 16 nor can it be withdrawn once inserted therein but rather it is.