A putter-type golf club comprising an alignment system and a club head assembly. This invention discloses a method of forming STI regions which have a controllable layer of nitrogen atoms at the STI sidewall interface. Units of data are stored in one or more data storage devices accessible to the intermediary server. The authentication process is performed according to the generated authentication result. In order to provide advantageous plug-in connections it is proposed that the plug-in noses each comprise a guide tube with at least one rubber-elastic clamping ring which encloses the guide tube on the outside, rests on an axial abutment and can be subjected to axial pressure with the help of an actuator penetrating the guide tube. A television interface is provided that displays multimedia information that may be stored in a multimedia document.