A method of operating a screwdriver to fasten a screw to a work surface, the screwdriver comprising a base, a carriage moveably coupled to the base along a first axis, an actuator operable to move the carriage relative to the base, a slider comprising an attached screw bit, wherein the slider is coupled to the base through the carriage and the slider is moveably coupled to the carriage such that the slider and attached screw bit move together along the first axis relative to the carriage, and a position detector operable to detect a position of the slider relative to the carriage, the method comprising:
- moving the carriage relative to the base to move the screw towards the work surface;
- and
- detecting relative movement between the slider and the carriage using the position detector.