A method of manufacturing a series of inhalers that each have an incremental dose counter fitted thereto which includes the steps of: a) manufacturing a series of incremental dose counters for inhalers, wherein each dose counter in the series comprises an incremental counting system having a main body, an actuator arranged to be driven in response to canister motion and to drive an incremental output member in response to canister motion, wherein the incremental output member comprises a ratchet wheel having a plurality of circumferentially spaced teeth to engage the actuator and wherein the dose counter further comprises a count pawl arranged to engage the incremental output member, and each dose counter has a start position in which the actuator has not been pushed down during a canister depression, a reset position in which the count pawl is engaged with the back surface of a tooth of the ratchet wheel and the actuator has engaged another one of the teeth of the ratchet wheel such that any further depression of the actuator will rotate the ratchet wheel, a canister fire position in which actuator is in a lower position than in the reset position and the count pawl is spaced from the back surface of the tooth of the ratchet wheel it engaged in the reset position, a dose count position in which the actuator has rotated the ratchet wheel by the distance circumferentially angularly between two of the teeth, such that the count pawl has finished riding along a forward surface of one of the teeth and has resiliently jumped over the tooth into engagement with the back surface of the next tooth, and an end position in which the actuator has been further depressed by the canister and disengaged from the teeth of the ratchet wheel; and b) fitting each dose counter in the series of incremental dose counters to a corresponding main body of an inhaler; and wherein the step of manufacturing the series of incremental dose counters further comprises manufacturing the dose counters with nominal canister fire and dose count positions of the actuator relative to a dose counter chassis, and which includes building the dose counters with the average dose count position in the series being, in canister fire process, after the average canister fire position in the series. a) manufacturing a series of incremental dose counters for inhalers, wherein each dose counter in the series comprises an incremental counting system having a main body, an actuator arranged to be driven in response to canister motion and to drive an incremental output member in response to canister motion, wherein the incremental output member comprises a ratchet wheel having a plurality of circumferentially spaced teeth to engage the actuator and wherein the dose counter further comprises a count pawl arranged to engage the incremental output member, and each dose counter has a start position in which the actuator has not been pushed down during a canister depression, a reset position in which the count pawl is engaged with the back surface of a tooth of the ratchet wheel and the actuator has engaged another one of the teeth of the ratchet wheel such that any further depression of the actuator will rotate the ratchet wheel, a canister fire position in which actuator is in a lower position than in the reset position and the count pawl is spaced from the back surface of the tooth of the ratchet wheel it engaged in the reset position, a dose count position in which the actuator has rotated the ratchet wheel by the distance circumferentially angularly between two of the teeth, such that the count pawl has finished riding along a forward surface of one of the teeth and has resiliently jumped over the tooth into engagement with the back surface of the next tooth, and an end position in which the actuator has been further depressed by the canister and disengaged from the teeth of the ratchet wheel; and b) fitting each dose counter in the series of incremental dose counters to a corresponding main body of an inhaler; and