Modeling Hanging Masses as Rigid Bodies in Kangaroo 2

Is there a way to fix the connection of a spring to a rigid body so that the end point of the spring always stays in the same spot on the rigid body?

I am using Kangaroo 2 to model several hanging masses. There is a series of hanging objects (modelled with the RigidBody component) connected by cables (modelled as springs), and I would like to see how adjusting the length of the cables changes the objects position in space. Forces are applied at the endpoints of the springs. Currently my definition uses the OnMesh component to keep the endpoints of the springs on the objects. The issue I have encountered is that endpoints of the springs will stay on the mesh, but they move from their original position.

Thanks for the help!