An insertion system, the insertion system comprising: a device housing configured to be operatively engaged with and disengaged from a base adapted to be carried by a patient, the device housing engageable with an actuation device, the device housing comprising: a carrier body arranged for movement within at least a portion of the device housing at least between a retracted position and an advanced position, the carrier body for supporting a piercing member in a position orientated for insertion through skin of the patient upon movement of the carrier body from the retracted position to the advanced position, the carrier body operatively engageable with a moveable carrier body of the actuation device so that the carrier body of the device housing moved by the carrier body of the actuation device at least between the retracted position and the advanced position; and characterized in that the device housing has one or more flexible fingers for supporting a portion of the carrier body of the device housing and for preventing the carrier body of the device housing from moving to the advanced position, the fingers being moveable relative to the carrier body of the device housing to provide sufficient clearance to allow the carrier body of the device housing to move to the advanced position in a case where the carrier body of the device housing is moved by the carrier body of the actuation device. a device housing configured to be operatively engaged with and disengaged from a base adapted to be carried by a patient, the device housing engageable with an actuation device, the device housing comprising: a carrier body arranged for movement within at least a portion of the device housing at least between a retracted position and an advanced position, the carrier body for supporting a piercing member in a position orientated for insertion through skin of the patient upon movement of the carrier body from the retracted position to the advanced position, the carrier body operatively engageable with a moveable carrier body of the actuation device so that the carrier body of the device housing moved by the carrier body of the actuation device at least between the retracted position and the advanced position; and characterized in that the device housing has one or more flexible fingers for supporting a portion of the carrier body of the device housing and for preventing the carrier body of the device housing from moving to the advanced position, the fingers being moveable relative to the carrier body of the device housing to provide sufficient clearance to allow the carrier body of the device housing to move to the advanced position in a case where the carrier body of the device housing is moved by the carrier body of the actuation device. a carrier body arranged for movement within at least a portion of the device housing at least between a retracted position and an advanced position, the carrier body for supporting a piercing member in a position orientated for insertion through skin of the patient upon movement of the carrier body from the retracted position to the advanced position, the carrier body operatively engageable with a moveable carrier body of the actuation device so that the carrier body of the device housing moved by the carrier body of the actuation device at least between the retracted position and the advanced position; and characterized in that the device housing has one or more flexible fingers for supporting a portion of the carrier body of the device housing and for preventing the carrier body of the device housing from moving to the advanced position, the fingers being moveable relative to the carrier body of the device housing to provide sufficient clearance to allow the carrier body of the device housing to move to the advanced position in a case where the carrier body of the device housing is moved by the carrier body of the actuation device.