I have replaced the sliding door card with a table but I find when the door is fully open, it rubs agains the wheel arch, which incidentally has the Vw wheel arch cover fitted. The door clears the arch until the middle hinge locks the door back as it pulls the door towards the van. If I pull lightly at the rear of the door it moves away from the arch. The middle hinge is spring loaded to push the door away from the body when opened, but is not under tension when the door is in the Fully open position. Is this normal, or has the spring become weak with use? If