will therefore upon any further depression of the pin 34 begin to rotate the wheel 94 this is referred to as a u201c reset u201d position or configuration in this configuration the lower side edge 98 of the actuator 80 is 0 64 mm above the datum plane 220 fig1 d shows a configuration in which the actuator pawl 80 has been moved to a position lower than that shown in fig1 c and in which the metered dose valve not shown inside the canister has at this very position fired in order to eject active drug and propellant through the nozzle 44 it will be noted that in this configuration the count pawl 138 is very slightly spaced from the back surface 140 of the same tooth 92 that it was engaging in the configuration of fig1 d the configuration shown in fig1 d is known as a u201c fire u201d configuration in this configuration the lower side edge 98 of the actuator 80 is 0 47 mm below the datum plane 220 fig1 e shows a further step in the sequence called a u201c count u201d position in which the actuator pawl 80 has rotated the ratchet wheel 94 by the distance circumferentially angularly between two of the teeth 92 such that the count pawl 138 has just finished riding along a forward surface 142 of one of the teeth 92 and has resiliently jumped over the tooth into engagement with the back surface 140 of the next tooth accordingly in this u201c count u201d configuration a sufficiently long stroke movement of the pin 34 has occurred.