This was an insane 5 hour project. Following the directions to a T. The long screw heads stripped WAY too easy, trying to get one out to try to get a straighter hole, it snapped. So then trying to figure out a way to rig up some sort of solution. Got some washers and nuts, but now the decorative buttons are useless to try to make it look better. The directions of cutting the tunnel 1/4” shorter than the wall, left an almost 3/4” gap and now we have to figure out a way to build up the tunnel and make it weather proof/air tight. The directions need to specify to install it against the house outside, not on the siding. There is no way to snug it secure over the siding, especially with the tunnel too short and the long screws breaking. A bit disappointed with paying over $500 for a dog door and having to ‘make do’ and rig up alternate ways to install it to make it work. Now just to train the dogs to actually use it. Living in Wisconsin, I hope that I don’t regret even more, spending this amount of money, and it will be worth it. Questioning that decision tonight!