Anchor at connectedbody

How can I get the anchor of a Hingejoint at the position of the connectedbody?

I have 2 cubes. The red ones can move and the blue one only follows. The blue one has an HingeJoint and the connectedbody of the hingejoint is the red cube.

How can I make sure that the anchor of the connectedbody stay at the same position as the red cube?

 function Update(){
 
     verticaal = Input.GetAxis(script.verticaal);
 
      if (Mathf.Abs(verticaal)<0.5) 
      {
          verticaal = 0;
      }
 
         if(verticaal != 0)
         {
 
             transform.hingeJoint.connectedBody = null;
 
             if(transform.position.y > 2 && verticaal < 0.5 ||transform.position.y < 23 && verticaal > -0.5)
 
             {
 
                 transform.position += Vector3.up*verticaal;
 
                 transform.hingeJoint.connectedBody = redcube.rigidbody; 
 
                 transform.hingeJoint.anchor.y = redcube.transform.localPosition.y - bluecube.transform.localPosition.y;
 
                 transform.hingeJoint.anchor.x = redcube.transform.localPosition.x - bluecube.transform.localPosition.x;
 
             }
         }
 }