what is this rubber insert from kss-210a transport?

[hmkhm]

Hello, everyone.

I've just replaced a kss-210a laser pickup in the Denon DCD-1650G(DCD-2560) CD player. It's a first job by myself in fact.
And I found some kind of rubber insert as shown in the picture, which must come from the transport mechanism I fixed but I don't know where it should be placed in the transport.
My CD player seems to work but I'm afraid the CDP goes worng way without this rubber cap.

Please tell me where it should be placed properly.
Thank you.

[tiefbassuebertr]

as I know, this rubber is the damping rubber for the subchassis springs.

[hmkhm]

Originally Posted by tiefbassuebertr

as I know, this rubber is the damping rubber for the subchassis springs.

Thanks a lot!
I saw 4 springs which suspend the mechanism.
Maybe I could place it to its proper place.