Quote Originally Posted by ductape View Post
I've seen them used in hammer mode to drive electrical ground rods<snip>
You can buy a bit to drive ground rods.

I wouldn't use a homemade one, they tend to round off the end and then might not come off. The shock of driving is kind of hard on welds (voice of experience)...

Too loose and too much mushroom, too tight and won't come off when it mushrooms...