I posted before how Hobbes is a smart cookie. He's figured out quite a while ago how to pull in the cat flap and go out when it's in one-way configuration:
https://mastodon.social/@finestructure/111175356738100738
I've since started flipping it to block both ways at night. Here's a video where I cycle through the settings and I hope it shows that this isn't easy to turn. I don't think a child could turn this little wheel. It's quite small, which means you have little leverage to turn it:
#Caturday #CatsOfMastodon (1/3)