PUF
How to fit the pet flap?
Fit the flap and secure it with the screws supplied, which may have to be cut and filed to remove any sharp edges. 4 short screws are supplied for fitting to glass doors and 4 long screws for all other installations on a thickness of up to 55 mm. The 4 long screws will have to be shortened for installations on an intermediary thickness. For installations on a thickness of 45 mm shorten the screws by 10 mm; for installations on a thickness of 35 mm shorten the screws by 20mm, and so on. Instead, you could purchase a new set of screws to your specifications at your local hardware store. Too short a screw could strip the thread whereas too long a screw could break the front panel of the pet door.
To finish the job, cover the screw holes using the plugs supplied, making sure to match the rib to the seat.
Flap assembling