Design flaws, including

In this otherwise excellent accessory there is a design flaw, which makes the cover after a short time useless. Only thus we needed a new shredder. This has exactly the same mistake, but now recognized and remedied.
The coupling element is seated too tightly between the drive unit and cover, so looped plastic on plastic and is hot to the plastic of the lid melts. Therefore, I have reduced the upper end of the coupling element 2mm.
Now it fits.