Deal with 3 major types of parts:
Plates - camera flash housing, batteries contact plate, plug, supporter, shell, rings,
Lathe - truncates, stamp, non- core grinder, inside and outside circular arc, ascent, double line tooth, multi- line tooth, tubular swirl and so on complex job
Spring - torsion, pulling, pressure spring. Different kind of battery safety spring, micro switch, contact spring, remote control battery spring, clothes peg, stationery accessories, jewelry, the complete set of camera use spring, different shape spring.