Swingweighted metalwood golf club and method of assembly thereof

A metalwood golf club which comprises a clubhead comprising a cast metal shell having a playing face with a heel and a hosel extending upwardly from said heel providing a shaft receiving socket, a hollow shaft positioned therein, a barrier at the base of said hosel forming with said shell an enclosure means for receiving a rigid foam forming material injected through an opening in said barrier to provide a rigid cellular core, said barrier also providing a stop for the end of said shaft, a swingweight incorporated into said core at said heel which comprises an elongated cylindrical weight unit having a predetermined weight, length and diameter, an opening in said barrier conforming to the diameter of said weight unit, a cylindrical opening, in said core in alignment with said opening and said hosel, said weight having a collar extending around its periphery at its upper end having a diameter slightly larger than the opening in said barrier to permit engagement therewith and an upwardly extending extension having an outer diameter conforming to the inner diameter of the hollow shaft, said weight being positioned within the said cylindrical opening in the heel of said clubhead with its collar in engagement with said barrier and with its upward extension affixed within the end of said tubular shaft thereby providing an added swingweight extending downward from said shaft and hosel in continuous alignment therewith into the heel of said clubhead.