There are some people that my mom kind of knows, and I have heard of others who have one. It is a triggering mechanism stuck in the tunnel path as a regular mole trap but when the trigger is tripped you have a shotshell with just powder loaded, no shot and the sound will kill them instantly, thats why if you shoot at the hill when they are pushing, they dont have to get hit by the shot, just the precussion does them in. I read that they have been illegal since the 40's, whether its true or not I can see how it would be dangerous with the shot loaded but just a shotshell with powder in it would be fine. I have spent many hours trying to find plans or an old one so I could build a few but no luck, thats what I was curious about.

and Jeff as for making them a hair pin trigger, I have done that, filed off the edge of the rod, bent the trigger down, and many other small things, they just seem to be getting ALOT smarter[:@]