Thanks again for getting back to me (apologies for the delay each time but I am in Australia). I have a ball hitting a bat that causes the bat to tilt backwards slightly each time until the ball ends up going over the top of the bat. I am trying to ensure that the bat can either not be moved by the impact of the ball (I have tried adding large mass and increasing dampening but it has little effect) or I can get the change caused by the impact and reverse it.