Ciao MonteZooma...
thanks for the useful info.
Good point.
Today or tomorrow I'll take off the blades and see the arm "angle" of the passenger's one and the driver's one and see how they look like.
How did you checked the angle to make sure that they were flat?
You put back them on the screen (obviously not making them run :)) and looked at their position or is there any better way to check those?