... rivet spacing 铆钉距 rivet stem 铆钉杆 rivet tongs 铆钉钳 ...
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rivet stem or rivet mandrel 钉芯
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Kanevsky notes that in the 18th century, craftsmen would pierce the flowers with the stem, folding the end over and flattening it to form a rivet, because they didn't have good glues.
WSJ: Porcelain Flowers Never Die
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