[ASA Vet]

Sounds like the same trap I have. I used tuna, and it seems the cat would be able to get the tuna and exit before gravity could completely close the doors. I've considered adding springs to speed up the closure. I don't really care anymore, since the anti-freeze seems to have solved the problem, but I don't like to have something not work.

[snarkpup]

Sounds like the same trap I have. I used tuna, and it seems the cat would be able to get the tuna and exit before gravity could completely close the doors.

This is one problem I never experienced. Unless you have actually seen the cat dart out while the boom is being lowered, I doubt this is your problem. You may have something like problem #2, or perhaps the bait is being taken by an animal (dog, possum) large enough to block the fall of the door and then back out.