My passenger seat has been doing a bit of rattling which can be quite irritating. I've had a look underneath to try and diagnose the problem and it seems that on one side where the rails join it is a bit lose i.e. there is a small bit of play between the rail attached to the seat and the rail attached to the car. This is what is causing the rattling noise. It doesn't appear that this can be tightened and I'm wandering whether a new rail is required on one side? Can anyone help me here? Can it be adjusted?