Re the W202 wiper mechanism.... As it sweeps across, it should move up and down, correct? on all W202 models of whatever age, correct? I was looking at a '99 C43 today. The wiper swept across ok but didn't move up and down? And yet it covered right up to the top of the windscreen in the centre and to the outer edges too? Coverage was as I would expect. Apologies if this is in the wrong section. Mods please relocate if required.