Hi,
I just had the thought that I might be on the verge of discovering a previously unknown cosmic law.
-> No overlapping lid fits into the opening that it can cover.
Thanks for the offer, Bertil. I'll take the well-padded roof racks; that should do the trick. I managed to find some rust-free parts in Aachen. My trunk looks like it's in springtime; it's blooming everywhere

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@BM: Great tip. Especially the one with the saw... and keep on sniffing laughing gas.
Best regards, Kai.