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Another option to consider is the use of nutserts. They are like a pop rivet with an internal thread. Great for sheet metal and available in aluminium or steel. Smaller nutserts are installed with a tool similar to a hand riveter whilst larger nutserts can be installed with an air operated tool. Smaller ones can be installed with the use of a bolt and nut and two spanners. Use grease on the thread during installation to avoid damage. Google "nutsert".
Cheers
Dave
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