A method, system and software for determining a final staffing schedule by scheduling a plurality of staffing resource units into a plurality of shifts. The delivery instrument comprises a housing, a plunger and an advancer movable within the housing, the advancer having a first portion and a distal portion hingedly connected to the first portion and forming a casing for supporting the hole covering member. Manipulation of the injecting force and opposing stacking force allow greatly increased length or volume of injection.