A strap pressing device for a strap packing apparatus includes a strap presser, an eccentric shaft, and a spring. % Cr with a protective metallic coating by: heating the flat steel product under an oxygen-free heating atmosphere to 100\xb0 C. The buffer is made of a material having a coefficient of thermal expansion smaller than that of the body of the casing, thereby decreasing undesirable movement of the terminals leading to fatigue of the wires which arises from a change in temperature of the casing. The fuel injector of the preferred embodiments can be calibrated to an angular position about the longitudinal axis to achieve a desired targeting of a flow area and desired flow area distribution and atomization of the fuel injector. The coiling piece includes a coiling post.