After doing this to one side of mine, in spite of being obsessively careful, I sat down in a fit of rage to reread the owners manual (mine's in German, give me a break!). So it turns out, after rolling up the fabric, we are supposed to stuff it behind and UNDER the black woven webbing that is behind the clamp. No Westfalia employee where I bought the van, or VW employee where I have the van serviced and had the roof rot repair done, told me this when we went through how to properly put the roof down. News to me, but I hope I spare someone else the pain. I habitually reread the manual as evening entertainment before going to sleep (I'm currently single, could these be related...), and even I had never found this before. But, it's there. Even so, this is VW's 21st century solution to a roof clamp on a 70,000 euro vehicle. Unbelievable.