A method and device for delivering medicament such as for ameliorating pain in a patient from an injector superiorly andor laterally andor anteriorly towards the sphenopalatine ganglion. A number of arrangements for pistons and cylinders of unconventional configuration are described, mostly intended for use in IC engines operating without cooling. The adjustment assembly includes an adjuster that defines a through bore for slidably receiving a retaining stud that extends from the pump housing. The present invention can also be viewed as a method for providing group interactivity.