A golf club, namely a driver, includes a flowing moving part within the head such as mercury or a flowable solid in an inclined U shaped hollow passage. At least two connection ports are formed on the cover for wiring various telecommunication lines such as indoor and outdoor telecommunication cables with various sources. The first tightening mechanism is distinct from the second tightening mechanism. Furthermore, methods for producing the non-human animal model, sperm cell, and embryos are disclosed. The deflector can be used in conjunction with or without a conventional dock seal or dock shelter. Adjusting the height, or the width, of the convex part makes it possible to control the magnetic back pressure applied to the rotor.