Hi p8mog, thank you for the quick reply. Rgr ref the wiper arm fulcrum pins, that is useful info for me, thank you. Ref the judder, it might be worth doing what I tried this morning and spray on a soapy water mix while the wiper is working and see if the judder stops..if it does it points toward the blade to screen friction.. I would check to see if your wiper blade rubber is at 90 deg to the windscreen glass so its at the optimal position, if it isnt then you might need the wiper blade arm lightly bending at the wiper blade end to make this happen. This needs to be considered and undertaken carefully with specific tools. The fact that your judder is mostly on one arm/wiper suggests that the rubber blade angle presentation could be some of the issue. Its worth checking. In addition, you could consider to super clean the screen.
