Wing
Wing: another name for the bit of a bit key. Also, one of two projections on a metal plate attached to a night latch thumb turn which serves to retract the latch when the thumb turn is turned. Also, one of two projections on a metal plate which transfers the motion of the connecting bar through the night latch back plate to retract the latch when the key is turned. Wings are similar in function to the horns of a hub.
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