Product review (2 stars): Had to modify it to get it to work properly.
I had to modify this spring in order for it to work properly.  The bends were not in the right place causing the flap to be out of position and not allowing for proper closing.  The bends were too far away from the wound spring part. After a slight modification with a pair of pliers it now works properly but I feel I shouldn't have to have done that.