In situ the string definitely does zilch, just looks sort of pretty
I used it to hold the screen frame steady whilst I worked on it.
It would be nice if some really clever Audi trained person came up with the real reason for a bit of string on a prestige motor.
After all my Opels of yore did not have string on them so it cannot be a German thing.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)