A constrained frequency resonator is incorporated into the shaft of a striking implement for transferring and, advantageously, amplifying momentum from a striking end to a gripped end of the striking implement, thereby amplifying the sensation of a strike felt at the gripped end. The resonator has a substantially hourglass shape, with wide ends and a narrow waist, and is made of stainless steel or another very hard material. The shape of the resonator causes it to act as a vibration frequency filter that transfers and, preferably, amplifies a certain frequency or band of frequencies. The striking implement may be a golf club, pool cue, or other implement in which frequency transfer to a gripping section is desired.