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I believe the screw in the fender washer is the original screw from that hole, where the neutral bus was removed; it's not a sheet-metal screw at all.

You can believe that, but you would be mistaken. [Linked Image]

The original screw was gold in color, take a look at the neutral bar mounting screws that remain.

If you saw it in person you would have no doubts. [Linked Image]

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts