I had a look at the pictures- is the grey line where you filed?- mines completely smooth- will try to upload a picture (seems to be catching on the edge where the paint has worn away slightly)
I have the same problem with mine- I opened the flap but can't see the strips you mention the stand proud- there is piece that the washer nozzle pushes against but it's smooth on all sides- I can't see any ridges- can you help? Thanks
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