I’ve finished debugging, testing, re-testing, re-debugging, and so on. This is as good as it is going to get code-wise.

So here are more pictures:

1. On top of the “light” version (cannot be padlocked or chained) I’ve added two variants with a shorter and longer shackle (called XS and XL) to offer more adjustment flexibility.
2. I haven’t really shown a good shot of what the captive ring indents ended up looking like, pretty crisp for what it is.
3. XL + a tag plate, and while they are smaller than on other items, it’s still ridiculously cumbersome. I guess it works if you don’t plan on having a formal diner that day.

(But you don’t, since you eat your food from a bowl on the floor, right? :P)