It hooks to the door with two spring loaded hooks one on top and one on the bottom of the door I did put one screw through it to keep it from bowing out and shaking. And as for the door after some time it might ware off some of the paint. Hope this helped.
answered 5 days ago
0out of0found this answer helpful.
Can you mount on wall?
I am interested to know if instead of using springs on door, if this could easily be mounted on a wall next to a window? My cats would love this, if it could be utilized near a window where they could climb up and watch the birds.