To adequately repair the dents in this pendok, a mandrel is required. Only the maker, or somebody working in this craft would have a suitable mandrel.
A makeshift job could be done by using a long piece of wood with a rounded curve at its tip to just lift the dents a bit from the inside.The dents would be lifted out, or pressed out. It would be worked cold, use of heat would raise the risk of loosening the solder joints.
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