Morning Lorne, thank you for your thoughts.. I had found it near on impossible to get accurate answers from the factory over the last 18 months when we were having a run of warranty issues on the car, yes, the faults were rectified ( in time), but nothing in depth explaining the cause of each issue. Quite frustrating. Anyway, ref your Yellow arrow in the photo.. that is the Allan hex screw that passes into a splined wedge that clamps the wiper arm to the wiper spindle. Basically by tightening the screw the wedge is drawn up beween the spline on the wiper spindle and splines inside the wiper arm cap itself, this then secures the arm in position on the spindle ( or its meant to. ).. I have found that it is wise to apply a little Locktite 243 ( Blue ) to the screw as it has a habit of slowly loosening, thus allowing the wiper arm to detach from the spindle... This has happened...
As per Richard, Dave and Jons comments I will first thoroughly clean the screen.. The internet seems to indicate that applying a screen coating could either improve or cause screen wiper judder.. but most seem to say cleaning the screen and testing for judder is the first step.. I am still deeply suss of the fact that the wiper arms have side to side play at their spindle, the section of the arm that goes to the blade is pulled tightly to the wiper arm end cap by its spring, so the "play" at the spindle feels sprung loaded, but the fact that its there on all three arms may be due to design or poor manufacture, just dont know until someone can take a look at their "judderless" car and see if its meant to be...
