I work with an avid trapper who told me today when he was targeting cats that he fastened the lid of a pickle jar to the pan. Died or dipped the trap as usual. Claims that he didn't make a real attempt to cover the trap either. Said trigger pull was set at 3.5 Lb. and when the trap was set, he filled the lid with sand. According to this man, a cat will step in this fresh sand every time he comes by it. Haven't tryed this yet, but i've seen some of this guys results and he knows how to trap.