tackled the greasy contacts on the wipers this morning, everything came apart fairly easily, apart from 3 of the black plastic panel screws so need to find some more, managed to draw blood, manifold heatshield is a bit sharp, but all seems well with the wipers, they now return to their resting position every time 
. i'd just like to say what an excellent "how to" 
. i'd just like to say what an excellent "how to"