Abstract: A golf swing training aid intended for practice use by a golfer as a removable attachment to a standard golf club. The training aid comprises a specially adapted clamp assembly for releasable attachment to the grip of the golf club, a handle member projecting rearward from the clamp assembly, and a bowed guide arm member extending forwardly from the clamp assembly and further engaging the grip so that the guide arm projects between the forearms of the golfer when his hands are positioned normally upon the grip. The clamp assembly comprises a deployable crown assembly of flexible finger members mounted in a radial configuration and fitted to move into and from within a collar housing in such a fashion as to selectively engage and release the grip end of the golf club.