Well, I thought I could make a video to demonstrate this, but it would seem my simplistic editor on my laptop isn't all that great. Still, I did post it to youtube. Check it out here:
and here's a few more still shots. The trigger stick:
The trigger stick actually holding the door handle open:
and the view of the door, with the closing latch at the bottom. Notice the brick on the door adds speed to the closing.
Edit/Update: I'm not making this *because* I want to catch something to eat (unlike what I say in the video) it's that I've been seeing evidence of varmits around the house and I want them gone. I went out late the other night and just out of the corner of my eye I saw some bushy tailed thing take off.