Rotating a bone via scripts

 Goal: To be able to rotate bone in script. shoulder is the bone I'm trying to rotate.
 Problem: No errors, but bone either
 1.) doesn't rotate in game
 or 2.) mesh doesn't move with bone
 
 Here's my script:

shoulder is a Transform var

 function PointToMouse(){
     if(shoulder){
         print("shoulder");
     }
     var playerPlane = new Plane(Vector3.forward,transform.position);
     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
     var hitdist = 0.0;
     if (playerPlane.Raycast (ray, hitdist)) {
     var targetPoint = ray.GetPoint(hitdist);}
     mouseVec = Vector3(targetPoint.x - transform.position.x,targetPoint.y - transform.position.y,0);
     zAngle = Vector3.Angle(mouseVec,Vector3(0,-1,0));
     if(zAngle>minZ && zAngle<maxZ){
     print(zAngle);
     shoulder.transform.localEulerAngles = Vector3(0,0,zAngle+270);
     }
 }

It prints shoulder and prints zAngle and zAngle is correct. Also, when shoulder is an Empty GameObject with a mesh as a child, the mesh will rotate. So I know the logic is right...

Any help?