The apparatus 1, wherein the latch means comprises a latch arm pivotally mounted for {HEAD ~ rotation} between {TAIL ~ a latching position} in which the said one blade is held in the corresponding slot, and an unlatched position in which said one blade can be moved out of the corresponding slot 
between
The apparatus 1 , wherein the latch means comprises a latch arm pivotally mounted for { HEAD ~ rotation } between { TAIL ~ a latching position } in which the said one blade is held in the corresponding slot , and an unlatched position in which said one blade can be moved out of the corresponding slot
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