DAN; don't care how hard the ground is frozen. if u have your bucket at th right angle , u will take out some divots/w3tcompact/icons/blush.gif. just do what i do, as snoon as the snow melts, pick them up and set them back in place, and let the spring rains meld them back to solid ground. tachs are useful, not necessary, just go by the sound of the engine.