Ok, so I did a search on Dart Traps that found a thread on exactly how they're made. But I can't seem to make one. I created a Tinkerer with 30 tinker (like the thread and the wiki say) and when I tried to "trap" a crate made with my GM Carpenter it said I couldn't. So I got 30 Carpentering on a char and had him make the crates. But I'm still not able to "trap" one of them, I just keep failing. What am I missing?