Hmmmmm...on the bottom pic, gotta love the 8-32 stub screws securing(?) the lugs to the buss...and looks like you'd have to take a few breakers out to torque said lugs...and the buss looks pretty bad...top pic, is that heat damage or rust above the buss?

Whoever engineered this was not too high up on the evolutionary scale. Then again, it's Zinsco.... [Linked Image]

On the plus side, at least it has a main!

Stupid should be painful.