Installation is so easy I didn't even have to remove the door. I used a small screwdriver and a coupon cutter from my kitchen drawer and installed it in about 10 minutes. . A busy mom and I easily made it on our own. They were amazing and provided some extra bolts and washers. Glad I lost one while holding the puck because they are so tiny. .If you are doing it yourself, push through and tighten the top two screws, then go around them one screw at a time, squeezing the sides together. My dog went back and forth for treats the first day. She's an 8 1/2 pound multipu and I have a small door, she has plenty of room.
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