In one embodiment, a golf club attachment mechanism comprises a hosel adapter with a first slot coupler across a top portion of the hosel adapter, and a shaft adapter with a second slot coupler across a bottom portion of the shaft adapter. The type V phosphodiesterase inhibitor is injected into the horse intravenously as a stand-alone agent from about one-half hour to about seven days prior to the onset of strenuous exercise. The capsules can be separated from the resulting web either by coating at least one of the dies with an electrical insulator, or by transferring the web from the dies to a second pair of dies which cut the capsules free. The disclosure also provides a lamp unit and a control device for implementing the method.