I have found that it is not always quick and easy to determine the bone number of a particular body part comprising a boned Skinmesh. These bone numbers are required for linking another Skinmesh or Rigidbody to a particular bone of a boned Skinmesh. Here is a small and simple tool which lets you visually determine which bone number corresponds to which bodypart (i.e. chest,head,left_forearm,right_foot.........etc,etc)

Run the project, and by using the [Up][Down] keys to step forward/back through all bones present, Andro will show a much reduced size bodypart for the currently selected bone. NOTE: If the parent bone of a particular bodypart is diminished in size, then so will its child bones also be diminished.