Dell Zino 400 Lid button missing

Hi there,

I recently got a Zino 400 HD off ebay and as advertised the button you press to pop the lid is missing.   I was hoping it was going to be easy to get a replacement button however I can't locate a supplier anywhere.

It appears to be a plastic insert that latches to keep the lid on, does someone know where i can get one for the UK?

For clarification the missing part is the button on at about 10 seconds into the video "How to dismantle and upgrade Dell Zino HD" that he presses to "Pop The Top"

Your held would be welcome.

Thanks in advance.