Problem assigning hj.connectedBody

Hi, I'm having a further problem with my ragdoll script. I drop this script onto each bone in a ragdoll and it sets it all up for me. I can't get the hingejoint parameters setting correctly. It refuses to assign the connectedbody, anchor position etc. I've tried putting it in the update() function and it seemingly works fine.

 var manParentBone:GameObject;
 var manJointObject:GameObject;
 var manBoneWeight:float;
 var manIsEndBone:boolean;
 @HideInInspector //hides var below from the inspector
 var testbool:boolean = true;
 
 function Start () {
 
 if (manBoneWeight==0) // check to make sure the bone has weight
  {
  Debug.Log (gameObject.name+" has zero weight, setting to 1.");
  manBoneWeight=1;
  }
  
 var rb=gameObject.AddComponent (Rigidbody);
 var mc=gameObject.AddComponent (MeshCollider);
 
 rb.mass = manBoneWeight;
 mc.convex = true;  
 
 if (manIsEndBone==false) // Does the bone have parents?  If so, make a hinge connection to the parent.
  {
  var hj=gameObject.AddComponent (HingeJoint); //create hinge
 
  hj.connectedBody = manParentBone.rigidbody; //connect hinge
  hj.anchor = manJointObject.transform.position-gameObject.transform.position;
  hj.useLimits = true; //use hinge limits
  hj.limits.min = 5;
  hj.limits.max = -5;
  }
 }
 
 
 function Update () {
 
 }

As well as not being able to set the anchor inside the start() function, when I do set the anchor it seems to be wrong. If I want to set the position of the anchor to the manJointObject, then I just minus the manJointObject position from the bone. This should give me the position of the joint relative to the bone, right?

Thanks in advance for your help, I really appreciate it.