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Washers with nuts and bolts.
Or if you need more support / strength, the a flat bit of metal with holes, then washers, nuts and bolts.
When I was searching for an image I noticed universal roof box fixings. I've got some of these for my roof box and thinking about it, they would be a good shout as the plate is nice and thick.
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hugo7
How are people fixing boxes to racks? I want a semi permanent theft resistant solution....