Armature problem

I’ve added armature to some parts of my last project…with some strange results. It works fine everywhere except i this spot and I can’t find the problem. The mesh doesn’t follow the armature correctly but instead warps and distorts. Anyone familiar with the problem?

http://web.telia.com/~u91121962/blender/help.jpg

are the bones lined up with the mesh? Check in edit mode.

Found it. I had assigned the top ball to another group aswell by mistake. Thanx for the help anyway man :smiley: