Hi there, had a bit of a search, but couldn't come up with the answer, but apologies if its been covered before. Seem to have a small problem with the wipers and wondered if anyone else has experienced this - The wipers seem to have movement in them, and they seem to hit the deck as they return down, or run past the windscreen. Hard to explain, but you can move the wipers a few inches by hand, they seem to have a bit of slack somewhere??