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) :
|High Altitude Rocky Mountain Railroad by cjf2|
from On the Rails...
|Evening at the lake. by Murat ÜNSAL|