The handbrake. Obviously. Heater Rubber seals that stop the wind getting in. Radio? Pah. Dont make me laugh. Brakes in the wet. Brakes in the dry. Brakes. The engine if there is a R in the month. And sometimes when there is not. The transfer box when its been whelted. The transfer box when it hasnt. Jesus. Why do we bother. The only thing that works is me Landy spiders. I have two. Mary and Torquil.