Instead of leaving the ground area flat, use something like a chain saw sharpening stone in a Dremel tool to turn the flats into a pair of semi-circles. You could also do the same thing to a pair of small vise grip jaws. It's a lot simpler to just buy the tool I linked, which works well on both insulated and bare terminals. I haven't seen that pair of modified diagonals in many years- - - -I think it got lost or stolen.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!