Solve : Where this white rubber ring should go??

1.	Solve : Where this white rubber ring should go??
Answer» My SH224-BB DVD-drive didn´t READ discs anymore and I decided to TAKE this thing apart. Now when I got the case off, some WHITE rubber ring just fell out and I can´t figure out if it´s the RIGHT place for it: http://i.imgur.com/9K30iXi.jpg? I have tried it like that and it just fells off again.

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