Don't use copper. Plumbers user it because it's weak. Minimum half inch steel tubing which you can bend with a bench bender but won't withstand big hits either. You can hire a MIG welder and tack it to get welded properly later but I think you're much better off selling the Andy bags for a giant loop coyote.
Poorly made racks will crack. Better to not have a rack at all. Every kilo counts on a tiny bike particularly on single and double trails.
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