We had the same issue with the Mafell. Just happened to have another M8 Cap Head Bolt 25mm which worked perfectly first time. I think it is the bolt that is the issue not the clamp.
I had the same issue with the Mandela. So I happened to another M8 Cap Bolt 25mm which fitted fine first time. I think the issue is the bolt not the clamp.
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We had the same issue with the Mafell. Just happened to have another M8 Cap Head Bolt 25mm which worked perfectly first time. I think it is the bolt that is the issue not the clamp.
I had the same issue with the Mandela. So I happened to another M8 Cap Bolt 25mm which fitted fine first time. I think the issue is the bolt not the clamp.