I asked Patrick to replace my doggie door flaps and replace my doorbell. He said the doorbell was a process of elimination and was going to be expensive - okay that's plausible. But he said he couldn't get the old flaps off of the doggie door without disassembling the frame, which was going to be pricey. I know you don't have to take the frame apart to replace the flaps. I've replaced those exact flaps on another door before. You take the screws out and you pull the flap down. Maybe trying to take me for a ride? He left and I did the work myself, while holding my 4mo old baby. Don't waste your time with these guys.