I have a trap I made for hogs and it has one of those doors where they can keep comming in. It worked ok but not as good as I wanted so I ran a string from the door over the top and down the back to the floor where I tied it to a flat 2x4 inch of flat aluminum plate and put a 6x12 by 6 inch deep cardbord box on top of the aluminum plate and filled with corn so when they eat half the corn itflys up leting the door down. first nite 6 in the trap. better than I ever done! also put two small piles in front of box so while eating the piles more could come in before eating the corn in box.
I do believe this is going to be the cats meow.