I bought two of these at a large, orange home improvement store two days ago after reading reviews on Amazon.  Same price as here, by the way. Set them that evening, in the dark, using the technique advocated by other reviewers here... that is, gently tamped down a small section of a main, straight run until level with ground, cut grooves on either side for the trap jaws to sit in, set tap, and set trap down in grooves with the release lever sitting against the tamped-down ground.  One day passed with no action, but after a whole lot of rain yesterday evening, the mole was in the trap this morning!