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Title: Nearly impossible to install ~ Amazon should stop selling it!
Review: I had a friend of mine, a custom home builder, come over to my house to install this cat door. I watched in agony as he worked for almost 2 hours to complete the job. He said that it was much easier installing tile and wood floors in his homes than to install this simple device. I felt so guilty as I watched him repeatedly try to attach this flap to the door. In all the years that I've known him, this was the first time I've ever heard him swear. When he finally completed the job, the door worked just fine, but I still give it just 1 star due to the nearly impossible task of installing it. My advice to anyone contemplating purchasing this is, don't.
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