Don't the insulators in all ammeters have bushings where the conductors go through the metal mounting plate? Every one I've ever worked on does. Some folks lie awake at night wondering why the faucet isn't dripping!
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!