Easy, Inexpensive Doggy Door in a Screen Door

Step 5 Attaching the Flaps

I used rivets with washers to attach the flaps onto the support bar. 

First I put the flaps approximately in place, then I overlapped the flaps to get the most coverage.

Then I folded the top of each flap across the top of the bar, so it would be attached in two places. 

I used the Barge cement to glue the extra pieces of flap to the top for reinforcement.

Then I pierced the flap with an awl close to the edge of the door (to make a hole), put the rivet w/washer through the hole, put a washer on the far side, and used the pop rivet gun to attach it.  This might have been a little easier with a spring clamp to hold it all together.

I did this on both right and left sides.  Then I added a rivet in the middle.  Then I added two more, one on each side.  At that point it was well-secured.