Evening Jon, I do not disagree that the arms spring tension could be a contributing factor. Too much downward pressure of the arm onto the windscreen increases the loading and friction between glass and rubber ( stiction ).. In my cars particular case I have now found the remenant of a screen coating, plus in all three wiper arms there is a lot of arm side movement from play at the fulcrum pin, it does not look good there when the arm judders, also consider that the springs tension between the wiper arm sections is also spring loading closed the clearance and trying to hold it together.
I could now have three possible causes of judder.. A: Screen coating issues B: Too much play at the wiper arm fulcrum pin C: Possible high spring tension on the arms.
I feel I can presently dismiss the rubber wiper blade angle to screen as that looks good on all three wiper blades during their operation.
I can physically see A and B. So far three CX owners report no play on their wiper arms.. so I think I should sort A first, then consider B then C. Anyway thats my thought process on this at the moment based on info so far.
Last edited by Davetherave; 28/01/24 08:45 PM.
