On the S2 the two outside wipers actually do wipe. The centre one wiggles around a bit and makes a mess. I was told the best thing to do is actually bend the metal supports to get the position (not hit top or bottom, get it to rest without self destruction against the body) and work on the articulation of the hinge correctly. Fat chance, best bet would be applying for hogwarts for guidance on that one. The factory have had two goes and failed to date. They still park over the edge of the lower windscreen frame and so wreck the windscreen wipers within a couple of uses.
