This may even be the case with some D7K/MB-D11's too:
Does anybody else have a small amount of play between the grip and the body using the D90 with MB-D80? I noticed it with the ensemble on the tripod and think it can't be right.
I can obviously sandwich some spots of foam between the body and grip to get rid of it, but is this the case with other peoples MB-D80 grips too?