Lenco bearing - "Thrust plate support disc" - dimpled or not?

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d0dja

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Cleaning the bearing, and my "Thrust plate support disc", the thicker metal disc that goes under the thrust disc, has a dimple in it? Is it quite deep (1/3mm or so)?

From the various pics on the internet it looks vestigial, on mine it's quite pronounced. Is this support disc meant to be flat or dimpled?
 

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