Need to install a several ground rods? Stop swinging that sledge hammer and just set your rotary hammer to “hammer only,” then mount this adapter in the chuck and slip the hollow end over the top of the rod. The weight of the tool does the work — and does it without distorting the end of the rod. Models are available for various shank types, and they’ll set you back about $80.
Of course, one crafty ham radio operator found a DIY solution, too: take an old beat-up chisel attachment and attach a piece of automotive heater hose to keep the ends aligned. It’s cheap too, requiring only a cutoff tool, some tubing, and a hose clamp.