When sourcing used machinery, the mechanical integrity is paramount. You must verify the wear level of the crankshaft, eccentric wheel, and connecting rods, as these are the core components for reciprocating motion. Request a video of the machine running at full speed to check for abnormal vibrations or metallic grinding noises. It is essential to confirm if the nail mold (die), punch pin, and cutter are original or have been replaced with high-speed steel (HSS) parts to ensure consistent nail head shape and sharp points.