A workpiece supporting assembly, having a body member with an internal workpiece channel and a plurality of body openings communicating with the internal workpiece channel, supports a workpiece within the workpiece channel so that end portions of the workpiece extend from the body openings. After polishing interconnects, hollow metal void defects become visible. The preferred target DNA sequence comprises a Mr26 or a 16S rRNA gene or fragments thereof specific to H. Hooks 36 mounted to the front and rear side edge surfaces 5b of the airbag case 5 are joined to the mounting holes via a mounted section 35 extending downward from hinge sections 34 of reinforcement plate members 33. Other embodiments are disclosed.