I worked with an old guy who was the head of the maint dept, he flicked fuses with his finger to find a burnt out one.

He would grab YOUR arm and say "see lookit this" and flick his finger across each one, the one that did not zap you was the blown one. He used a rapid flick that would not allow the power to "lock" him to the energized component. Still I thought of it as incredibly stupid, but he was 70 at the time and had been doing it for 55 years he said.

Bill