I saw this thread this morning, and for most of the day I've been wanting one to play with. As I've never played with trap pins before. I thought "I could order one, but then I would have to wait a while since they aren't common where I am."
So, what did I do. I tried my hand at making one.



The one I have obviously has a larger keyway with an easier to pick combination. I've managed to pick this one a full 360. But this one suffers from crappy tolerances and weaker springs.
It was a fun experiment. One day I'll get the real thing and see what it is like. Good luck with the one you've got, that last cut is a real killer.