Devices, systems and methods of using a single turning knob and blade holder posts to align and lock a ceiling fan blade to a blade holder. An assembler can fit a blade with a matched pattern of openings over the upwardly protruding locating features on the blade holder until the blade bottoms on the holder. The knob is turned clockwise to lock in place against the stop feature on the pedestal, and counter-clockwise to unlock. Spring loaded detents can lock the turning knob in place in a counter-clockwise direction.