Loose MB-D11 for D7000

Mine does it...and I'd say that almost all the MB-D11s have some "wiggle" however whether a person notices it or not is another question.

Anyway, lots of threads on this issue. Here is a link to one person's solution (there are others within that same thread) : http://forums.dpreview.com/forums/read.asp?forum=1034&message=38161519
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James