Bird song operates perfectly, but possibly replaced bird fails to come fully upright, and does not quite engage for turning unless the box is inclined forward and gravity causes the bird to move upright, where one sees some motion; good quality sound; the cover may or may not return to position depending how well the bird returns beneath, so some adjustment and further analysis is needed; as with any bird-box, if it stops in the middle of a song with bird up, never force action, simply wind the box, as it has wound down, and allow it to go through its motions without pressure.
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