I know this is an old post by now but it seems to me like the metal cage is stiff enough that the energy may be internally dissipated by the rubber from the puck elastically deforming, while with the kevlar cage almost all the force is absorbed by the thread.
I know this is an old post by now but it seems to me like the metal cage is stiff enough that the energy may be internally dissipated by the rubber from the puck elastically deforming, while with the kevlar cage almost all the force is absorbed by the thread.