After several unsuccessful attempts, I could finally catch up with the two acquired pliers traps the evildoers in the garden. However, you need some patience (almost certainly several unsuccessful trips) to adjust properly and a little skill, the case: the sheet with the bait has to be clamped in the clamp it as easy as possible slipping in contact and thus snaps the trap. But it may just as well not slip out of itself. On the own fingers should also pay the "arming".
Whether you can not be better accesses traps that capture the animals alive, is another question. In any case my 3 killed voles have quite sorry for him, especially a mouse was still alive. On the other hand I also received the trees have felt sorry for him, the roots of which have eroded the voles before.