Not sure if it's the same, but I had a similar problem where the metal wire inside the blind came out (about 3 inches) because of a small rip and made it difficult to close and open (sometimes it gets stuck inside). I got a nail clipper and cut the part sticking out and it's fine now.

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2006 BMW X5 4.8is (current)
2006 BMW Z4 3.0si (current)
1992 BMW E30 325i cabrio M-tech (RIP)