A mixing system is disclosed in which the system comprises a source of bone-graft or bone-graft-substitute material, a liquid source, and a vacuum source, at least one of the source of bone-graft or bone-graft-substitute material and the liquid source being in communication with the vacuum source. Each physical object, of a plurality of physical objects, is associated with a unique corresponding identifier and with at least one person interested in the physical object. The method includes securing a perineal retainer body to the applicator by a locking bracket, and attaching the perineal retainer body to a body of a patient. An indentation for receiving a structural support is present in at least one flat wall face. An outer layer covers at least a portion of the bistable spring.