hi there. im new to this fourum. i have bought an xantia from my friends dad. when i bought it it took some work to get it started. its the 1.9td lx when i move the hight ajuster the frount raises and lowers fine but the bak stays upright ridgid. ( bounces about). is this the linkage to high ajuster or does it sound like i need to replace the spheres? looking forward to a relpy thankyou :D