Duct tape the disk to the pole below the box, pulling the two cut edges together some to form a cone with the wide end down. Then cut a straight line from outside edge to center hole. Using scissors, cut a 7" diameter circle from a piece of plastic (like a salad bar container lid), and cut a hole in the center (3/4" for metal conduit). Build a mouse-sized, cheap, unobtrusive predator guard.Move boxes away jumping off spots like shrubs, rocks etc., that would allow the mouse to gain access to the box itself.If you do use wooden poles, wrap thin flexible tin around the pole directly underneath the box down to the middle of the pole. Do not mount boxes low on wooden posts.Plug up the box (e.g., with a plastic or Styrofoam plug), or leave the door open until the ground freezes solid (at which point the mice have hopefully hunkered down elsewhere.) Of course this will make the box unavailable for other birds (bluebirds, chickadees, woodpeckers) that might use it to roost.Put the guard/baffle/sleeve a few inches below the floor of the nestbox. Make sure there is almost no gap between the baffle and the pole. Sitting on a hose clamp or other means to make it wobble), or a downspout sleeve over the pole.
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