set: Nodelabel_n  = Index;
set: Jointlabel_n = Index;

joint: Jointlabel_n, 
   revolute hinge, 
      Nodelabel_n-1,
         position, Length_Half, 0., 0.,
         orientation, 1, 1., 0., 0., 3, 0., 1., 0.,
      Nodelabel_n,
         position, -Length_Half, 0., 0.,
         orientation, 1, 1., 0., 0., 3, 0., 1., 0.; 
