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I'm missing the washer in the attached image (automatic advance unit) so I'm trying to replace it with an equivalent.
The parts catalog describes the washer (0400.46.010) as a "Bent washer".
Is it a wave washer or a conical washer?

Thanks

-Adrian

In Italian, it's called a "Rondella curvata", Adrian. English name, 'Curved spring washer'. Looks like this:



Used on many/most of the singles, wide-case included.

(The turned-up edges face into the work-piece, i.e. away from the bolt or screw head. You can always use a dab of Loctite if you're concerned about the bolt coming lose).

Got it, thanks!