controller problem

Hey all, For my rig I want to make a rotation controller in front of the finger. So If you would rotate te controller the finger rotates AND the controllers moves with it. (like in the image). How can I avoid the dependency loop errors? My teacher gave me this link http://paulneale.com/tutorials/Scripting/weakReferences/weakReferences.htm from paul neale, but can't figure it out. Can someone help me how I can do this? What does nodeTransformMonitor? 

Thanks alot