To arm, down the round piece trap entrance, down, then put the latch over the part of the same round, and secure it with the part of the probe which is above the trap, it is best to the probe bend a little towards the entrance of the mole so that it triggers faster, just cut out the earth on the length of the trap, the trap is ready for 2 starters, careful, sometimes there are more; then put a second trap; I highly recommend, to leather gloves mechanic kind, springs, are very effective, also for your fingers, watch out! ... I've caught one this morning, I made a photo of the beast, j 'have several, proof that it works, watch your fingers! ...