Teac PD-H500 CD player missing part question

I've disassembled a Teac PD-H500 for cleaning and a new belt and after removing the CD tray the following part came out, but I have no clue where it came from and where to put it back.

Service manual is silent about it and only shows a drawing of the complete assembly. I only know it came from the side where the gears are located.

Any ideas? I think it's a kind of spring meant to prevent the CD tray from wobbling when moving.
 

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