Abstract: A dispensing mechanism dispenses even doses of a substance, and comprises a base, a leverable surface, a stepper mechanism; and a space for an application substance. The levered surface is hinged at one end or is collapsible and is pressed downwards towards the base to squeeze the space to force the substance out of the cartridge. The stepper mechanism is located at the far end of the leverable surface to halt pressing at intervals corresponding to even doses of the substance. A carrier for a cartridge incorporating the dispensing mechanism comprises a housing which may be pressed to squeeze the cartridge and dispense the substance, an insertion opening through which the dispensing cartridge is inserted and a dispensing opening which lines up with a spout on the cartridge and through which the liquid is dispensed. The carrier may be attached to the wrist or to bicycle handlebars and the like.