Thanks for the input Dave, the judder on the blades is in both directions on all three blades. It might as you say be worth removing one at a time to gauge if one is the issue..I assumed the factory would have done this, but maybe not.. worth a try.
Until I hear back from a Plus Six owner ref the question of play at the wiper arm fulcrum pin I will start with a multiple cleans of the screen with a good glass cleaner, just in case a coating had been applied... I have had a look on the net and I am now trying to find a screen cleaner that everyone says is A1.. As you say the judder is infuriating..
