Our mid 2020 Plus Six has always had wiper blade judder on all three arms/blades since we purchased it with 500 miles on the clock. It has been back to the factory twice for wiper issues, the first time to try and reduce the judder and the second time due to the wiper mechanism starting to fall to bits behind the dash and also the wiper arm judder. In both cases I was informed by the dealer at the time of the cars return that the mechanism had been replaced /upgraded at the factory, in the first visit the arms had been changed to 2022 spec. When the car was returned to us from the last factory visit before Christmas the judder was reduced, but not completely gone, however, in the last weeks the judder has returned big time on all three blades/arms. The wiper blades have been upgraded to the newer aftermarket type from the original design, these have been replaced twice in a year to see if it made any improvement - it did not. All three wiper arm angles have been tweaked to make sure the wiper blade sits at 90 deg to the windscreen, so the blade is at the correct angle to the screen.

As the factory have had two goes at the judder and not fixed the issue I thought I would re look at the wiper arms etc. Firstly I found that at least one wiper "box" is still the original, so was not replaced in the second factory visit, but do not think this is an issue. Secondly it is evident that all three wiper arms have quite a bit of side play ( able to be rocked side to side ) at their fulcrum pin, I do not know if this is normal?.
I have attached a photo with a Red arrow showing the pin where there is side to side play. Could owners of Plus Six cars with no windscreen judder on their cars slightly lift a wiper arm off the screen and move it up/down to see if they can feel any arm side play at the arrowed pin. I am wondering if there is meant to be side play at this point??. Normally I would go and look at another Plus Six to check, but there appears to be few in our area, plus each arm to replace is over £60.00 and has to be ordered in.

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Lastly, just to say that the windscreen is clean and free of pits. I do not know if the factory placed any coating on it, I dont think so as the water does not easily run off as seen with the likes of Rain-X etc.

I was also thinking to clay bar the screen then use a good glass car cleaner and maybe use a coating on the screen to see if that would work.. Looking on the internet there seems to be equal good/bad reviews concerning screen coatings stopping wiper judder.

We use our Plus Six in the rain, so it would be good to have a normal working wiper without judder. Plus of course the car is now out of warranty.

Dave

Dave
Plus Six "Squeak"
Roadster departed.
1936 BSA Empire Star Q8. 1935 BSA W7-35. 1938 BSA M20