How to set a Longworth trap
"So when setting your longworth you must check that when your door opens the hair trigger will trigger for it to shut again. That pretty vital otherwise you will not be able to capture anything. Once you’ve done that you must make sure with the door on the outside you take the main chamber which has two flaps, you push the larger one of the two back, and pull the little one to the front. You then must slide this in there are ears around the edge of this which you want to catch on the large one, as you pull forward the large flap inside should drop down and catch on it like this. You then want to tilt your longworth, bring the tunnel area forward and upwards until it clicks between these two sets of rivets on the bottom of it. And then clip with the top like this. When set, you’re longworth trap should always be at this sort of angle.
If you’re thinking about setting a longworth trap, you really need to be thinking like a small mammal. Small mammals always travel around the edge of a habitat. They want to avoid open areas, it leaves them exposed to their overhead predators. And so for that reason you need to be thinking about placing them along hedgerows, along walls and in overgrown areas where you know there is lots of cover."