Mounting that crazy thing to the door was a bit challenging… I used a bunch of those velcro-ish removable wall adhesive things from wal-mart. They didn’t work out that great, but held everything together for the most part! I helped out a friend with another design this year using a motor on a bracket that hangs over the door (just a piece of bent aluminum). This design is much more robust! The motor pulls a metal wire that is attached to the door handle. His design doesn’t actually pull the door open, but it is extremely reliable. Good luck! Let me know how it goes.